Is there any phrase or word that can be used to describe a slip of the tongue that happens in writing?
Calling it a slip of tongue directly feels awkward, especially when the written text is never intended to be read out loud (for example text from a discussion on an SE site such as this).
I've just read "slip of the keyboard" but I'm pretty sure that this is not (yet?) a common phrase.
"Typo" is a very similar term, but I usually use "typo" more for mis-typed words rather than mistakes that actually change the meaning of the text.