As for nitpicking, there are (way) more nitpickers here that nitpick on so called nitpickers than actual nitpickers, and that is saying quite a lot, it is not a rare thing to find on this site. But people that nag and whine just because someone pointing out an error. (And I mean error, not preference or disputabe stuff) are 100x worse.
Nitpicking to me is about things that do not change the validity of the quiz, like how the netherlands is absolutely butchered on this map and is hardly recognisable. Or wether micronesia should be listed under F or M. But if it is say a quiz of list all the countries of europe and paraguay is on there, pointing that out is NOT nitpicking. Asking/expecting a quiz to have the correct answers is not nitpicking.
Or my favourite. For instance people with famous last names. Let's say the last name Wright. "you left out/should accept Jonathan Wright, he was the waiter in 1 episode of a show that got canceled after one season back in 1969" People insisting on stuff being added while it clearly doesnt fit the bill. Correct as in having that last name, but obviously not what they were looking for.
Hmm... doesn't really have the same appeal, does it?