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It is not a grammatical error, it's just colloquial language. You have noticed correctly that this occurs in AmE. OED labels it so:

Now chiefly North American colloquial. (c. 1275)

‘What kind of a piece is that in that case?’ ‘A short rifle.’ ‘Will she shoot good?’ ‘Yes.’ (F. L. Olmsted, Journey through Texas ii. 59, 1857).

DailyWritings explains that

Both words [well and good] can function adverbially, but the use of good as an outright adverb was declined in British English in the seventeenth century. It resurfaced in the nineteenth century as an Americanism, as noted in Bartlett’s American Dictionary (1859):

English travellers have repeatedly noticed the adverbial use of this word [good].
‘He cannot read good.’
‘It does not shoot good.’

About its usage in sport, Merriam-Webster’s Dictionary of English Usage (pp. 480-481) says:

He treats me good expresses more appreciation than He treats me well, and She scolded him, but good can hardly be expressed with well at all. —Bolinger 1980

The justice of Bolinger’s observation is nowhere better illustrated than in the world of American professional sports, where good is the emotionally charged adverb of choice.
Our evidence shows that adverbial good is common in the speech of the less educated, but is also known and used by the better educated. It is almost de rigueur in professional sports. Bernstein 1977 reports that the adverb as used in sports grates on Edwin Newman (1974). But it does not grate on Reggie Jackson or Tony Armas or Billie Jean King, the ones who know the lingo.
And one should not assume that well is avoided out of ignorance—a professional basketball coach interviewed on television after a game began by saying that the team played good but in mentioning the contributing factors said that they shot well and they rebounded well. The nuances here are plain to sports fans but are overlooked by usage writers.

As the quotations above suggest, adverbial good is still primarily a speech form. Our evidence is mostly from reported or fictional speech, letters, and similar breezy and familiar contexts. It is not likely to be needed in a book review or a doctoral dissertation.

The bottom line is that in formal contexts some will cringe at the adverbial usage of good, whereas in informal contexts it is perfectly fine.

Note that when used with linking verbs good is an adjective (Predicate Complement, describing the Subject). (See Dictionary.com's Well vs. Good and M-W's Good vs. Well: Usage Guide)

It is not a grammatical error, it's just colloquial language. You have noticed correctly that this occurs in AmE. OED labels it so:

Now chiefly North American colloquial. (c. 1275)

‘What kind of a piece is that in that case?’ ‘A short rifle.’ ‘Will she shoot good?’ ‘Yes.’ (F. L. Olmsted, Journey through Texas ii. 59, 1857).

DailyWritings explains that

Both words [well and good] can function adverbially, but the use of good as an outright adverb declined in British English in the seventeenth century. It resurfaced in the nineteenth century as an Americanism, as noted in Bartlett’s American Dictionary (1859):

English travellers have repeatedly noticed the adverbial use of this word [good].
‘He cannot read good.’
‘It does not shoot good.’

About its usage in sport, Merriam-Webster’s Dictionary of English Usage (pp. 480-481) says:

He treats me good expresses more appreciation than He treats me well, and She scolded him, but good can hardly be expressed with well at all. —Bolinger 1980

The justice of Bolinger’s observation is nowhere better illustrated than in the world of American professional sports, where good is the emotionally charged adverb of choice.
Our evidence shows that adverbial good is common in the speech of the less educated, but is also known and used by the better educated. It is almost de rigueur in professional sports. Bernstein 1977 reports that the adverb as used in sports grates on Edwin Newman (1974). But it does not grate on Reggie Jackson or Tony Armas or Billie Jean King, the ones who know the lingo.
And one should not assume that well is avoided out of ignorance—a professional basketball coach interviewed on television after a game began by saying that the team played good but in mentioning the contributing factors said that they shot well and they rebounded well. The nuances here are plain to sports fans but are overlooked by usage writers.

As the quotations above suggest, adverbial good is still primarily a speech form. Our evidence is mostly from reported or fictional speech, letters, and similar breezy and familiar contexts. It is not likely to be needed in a book review or a doctoral dissertation.

The bottom line is that in formal contexts some will cringe at the adverbial usage of good, whereas in informal contexts it is perfectly fine.

Note that when used with linking verbs good is an adjective (Predicate Complement, describing the Subject). (See Dictionary.com's Well vs. Good and M-W's Good vs. Well: Usage Guide)

It is not a grammatical error, it's just colloquial language. You have noticed correctly that this occurs in AmE. OED labels it so:

Now chiefly North American colloquial. (c. 1275)

‘What kind of a piece is that in that case?’ ‘A short rifle.’ ‘Will she shoot good?’ ‘Yes.’ (F. L. Olmsted, Journey through Texas ii. 59, 1857).

About its usage in sport, Merriam-Webster’s Dictionary of English Usage (pp. 480-481) says:

He treats me good expresses more appreciation than He treats me well, and She scolded him, but good can hardly be expressed with well at all. —Bolinger 1980

The justice of Bolinger’s observation is nowhere better illustrated than in the world of American professional sports, where good is the emotionally charged adverb of choice.
Our evidence shows that adverbial good is common in the speech of the less educated, but is also known and used by the better educated. It is almost de rigueur in professional sports. Bernstein 1977 reports that the adverb as used in sports grates on Edwin Newman (1974). But it does not grate on Reggie Jackson or Tony Armas or Billie Jean King, the ones who know the lingo.
And one should not assume that well is avoided out of ignorance—a professional basketball coach interviewed on television after a game began by saying that the team played good but in mentioning the contributing factors said that they shot well and they rebounded well. The nuances here are plain to sports fans but are overlooked by usage writers.

As the quotations above suggest, adverbial good is still primarily a speech form. Our evidence is mostly from reported or fictional speech, letters, and similar breezy and familiar contexts. It is not likely to be needed in a book review or a doctoral dissertation.

The bottom line is that in formal contexts some will cringe at the adverbial usage of good, whereas in informal contexts it is perfectly fine.

Note that when used with linking verbs good is an adjective (Predicate Complement, describing the Subject). (See Dictionary.com's Well vs. Good and M-W's Good vs. Well: Usage Guide)

It is not a grammatical error, it's just colloquial language. You have noticed correctly that this occurs in AmE. OED labels it so:

Now chiefly North American colloquial. (c. 1275)

‘What kind of a piece is that in that case?’ ‘A short rifle.’ ‘Will she shoot good?’ ‘Yes.’ (F. L. Olmsted, Journey through Texas ii. 59, 1857).

DailyWritings explains that

Both words [well and good] can function adverbially, but the use of good as an outright adverb was declined in British English in the seventeenth century. It resurfaced in the nineteenth century as an Americanism, as noted in Bartlett’s American Dictionary (1859):

English travellers have repeatedly noticed the adverbial use of this word [good].
‘He cannot read good.’
‘It does not shoot good.’

About its usage in sport, Merriam-Webster’s Dictionary of English Usage (pp. 480-481) says:

He treats me good expresses more appreciation than He treats me well, and She scolded him, but good can hardly be expressed with well at all. —Bolinger 1980

The justice of Bolinger’s observation is nowhere better illustrated than in the world of American professional sports, where good is the emotionally charged adverb of choice.
Our evidence shows that adverbial good is common in the speech of the less educated, but is also known and used by the better educated. It is almost de rigueur in professional sports. Bernstein 1977 reports that the adverb as used in sports grates on Edwin Newman (1974). But it does not grate on Reggie Jackson or Tony Armas or Billie Jean King, the ones who know the lingo.
And one should not assume that well is avoided out of ignorance—a professional basketball coach interviewed on television after a game began by saying that the team played good but in mentioning the contributing factors said that they shot well and they rebounded well. The nuances here are plain to sports fans but are overlooked by usage writers.

As the quotations above suggest, adverbial good is still primarily a speech form. Our evidence is mostly from reported or fictional speech, letters, and similar breezy and familiar contexts. It is not likely to be needed in a book review or a doctoral dissertation.

The bottom line is that in formal contexts some will cringe at the adverbial usage of good, whereas in informal contexts it is perfectly fine.

Note that when used with linking verbs good is an adjective (Predicate Complement, describing the Subject). (See Dictionary.com's Well vs. Good and M-W's Good vs. Well: Usage Guide)

It is not a grammatical error, it's just colloquial language. You have noticed correctly that this occurs in AmE. OED labels it so:

Now chiefly North American colloquial. (c. 1275)

‘What kind of a piece is that in that case?’ ‘A short rifle.’ ‘Will she shoot good?’ ‘Yes.’ (F. L. Olmsted, Journey through Texas ii. 59, 1857).

About its usage in sport, Merriam-Webster’s Dictionary of English Usage (pp. 480-481) says:

He treats me good expresses more appreciation than He treats me well, and She scolded him, but good can hardly be expressed with well at all. —Bolinger 1980

The justice of Bolinger’s observation is nowhere better illustrated than in the world of American professional sports, where good is the emotionally charged adverb of choice.
Our evidence shows that adverbial good is common in the speech of the less educated, but is also known and used by the better educated. It is almost de rigueur in professional sports. Bernstein 1977 reports that the adverb as used in sports grates on Edwin Newman (1974). But it does not grate on Reggie Jackson or Tony Armas or Billie Jean King, the ones who know the lingo.
And one should not assume that well is avoided out of ignorance—a professional basketball coach interviewed on television after a game began by saying that the team played good but in mentioning the contributing factors said that they shot well and they rebounded well. The nuances here are plain to sports fans but are overlooked by usage writers.

As the quotations above suggest, adverbial good is still primarily a speech form. Our evidence is mostly from reported or fictional speech, letters, and similar breezy and familiar contexts. It is not likely to be needed in a book review or a doctoral dissertation.

The bottom line is that in formal contexts some will cringe at the adverbial usage of good, whereas in informal contexts it is perfectly fine.

Note that when used with linking verbs good is an adjective (Predicate Complement, describing the Subject). (See Well vs. Good and M-W's Good vs. Well: Usage Guide)

It is not a grammatical error, it's just colloquial language. You have noticed correctly that this occurs in AmE. OED labels it so:

Now chiefly North American colloquial. (c. 1275)

‘What kind of a piece is that in that case?’ ‘A short rifle.’ ‘Will she shoot good?’ ‘Yes.’ (F. L. Olmsted, Journey through Texas ii. 59, 1857).

About its usage in sport, Merriam-Webster’s Dictionary of English Usage (pp. 480-481) says:

He treats me good expresses more appreciation than He treats me well, and She scolded him, but good can hardly be expressed with well at all. —Bolinger 1980

The justice of Bolinger’s observation is nowhere better illustrated than in the world of American professional sports, where good is the emotionally charged adverb of choice.
Our evidence shows that adverbial good is common in the speech of the less educated, but is also known and used by the better educated. It is almost de rigueur in professional sports. Bernstein 1977 reports that the adverb as used in sports grates on Edwin Newman (1974). But it does not grate on Reggie Jackson or Tony Armas or Billie Jean King, the ones who know the lingo.
And one should not assume that well is avoided out of ignorance—a professional basketball coach interviewed on television after a game began by saying that the team played good but in mentioning the contributing factors said that they shot well and they rebounded well. The nuances here are plain to sports fans but are overlooked by usage writers.

As the quotations above suggest, adverbial good is still primarily a speech form. Our evidence is mostly from reported or fictional speech, letters, and similar breezy and familiar contexts. It is not likely to be needed in a book review or a doctoral dissertation.

The bottom line is that in formal contexts some will cringe at the adverbial usage of good, whereas in informal contexts it is perfectly fine.

Note that when used with linking verbs good is an adjective (Predicate Complement, describing the Subject). (See Dictionary.com's Well vs. Good and M-W's Good vs. Well: Usage Guide)