I'm looking for a succinct way of describing a mistake or tendency that pops up a lot. It's just a common error that a wide range of people seem to make over and over. The specific context I'm thinking of is software training and consulting but it could be used in other training/teaching scenarios.
Many people will use the first setting but in reality the second option is the appropriate choice for this application. Especially as you begin to use the software, you will want to be aware of this _____________.
I thought of pitfall but it implies a hidden danger due to the software being ambiguous or poorly designed. The fault isn't so much in the software but in the misunderstanding and tradition of the user.
I thought of pet peeve but that implies the lecturer is personally annoyed with the mistake which is incidental from the trainee's perspective.
I thought of simply saying common mistake. But, I wonder if there is a more colorful and succinct way of describing it. Maybe a single word? Or, maybe an impactful, memorable idiom like "pet peeve" but without the connotation of an annoyance.