Ok, I was thinking about something else than stylistic preferences, e.g. making an off-by-one error in an implementation of an algorithm during live coding. Something that indeed would be usually catched by a careful code review, but candidates sometimes undermine importance errors.
No, I see people complaining about a test not looking like what they expect, or minor nitpicks like variable names or not using the interviewer's favourite design pattern
Of course the same people who nitpick are the ones writing O(n^2) code and actually causing a major bug