Do you have an oddly specific nitpick other people usually miss?

So I was binge-reading today and encountered mine three times. It's a pretty common one when author uses 'his/her voice drops/raises several octaves'. Each time I read it, I know that the person who wrote it had no idea how low/high it is. Dropping/raising an octave is a feasible fit for a human voice range, I'll accept two even though it sounds dubious, but more then that? Especially if by several they meant something like five or six - congrats, your character just went beyond human hearing range