Occasionally we get a question of the form: "Look at this derivation/computation. Clearly, the result is wrong. Where is the mistake?"
It is slightly different from typical solution-verification question. Namely here the OP knows that the solution is incorrect, so strictly speaking they do not ask to check their proof but to find a mistake.
Or (most likely) is this something which has to be judged on case-by-case bases?
EDIT: Of course, neither of the above tags is supposed to stand on its own. So the question is supposed to be what tags should be added in addition to the tags identifying area of mathematics from which the question is.