I think I'm going to start with your last question and say "Wherever it feels right to you."
Because it's not like we're talking about an objective standard here. There are some common trends and patterns, certainly. Lots of people are thrown off when things from their own lives or jobs are shown wrong, for instance. But there's a lot of variation too. Some people can accept a lot more variation in culture things (even if it's their own). I personally reach a point where too many convenient coincidences will throw me off a work, although it's not exactly just about number.
Hell, I can think to an RP where I used a name for my character that was, by my own standards, wrong. It's not something I was entirely happy about, but doing the 'right' thing in that case would have thrown me off mentally to a degree that, well, it really wasn't worth trying to do anything about it.
No one's going to be perfect, so you've pretty much got to decide what your own tolerances are.
-Morgan.
Because it's not like we're talking about an objective standard here. There are some common trends and patterns, certainly. Lots of people are thrown off when things from their own lives or jobs are shown wrong, for instance. But there's a lot of variation too. Some people can accept a lot more variation in culture things (even if it's their own). I personally reach a point where too many convenient coincidences will throw me off a work, although it's not exactly just about number.
Hell, I can think to an RP where I used a name for my character that was, by my own standards, wrong. It's not something I was entirely happy about, but doing the 'right' thing in that case would have thrown me off mentally to a degree that, well, it really wasn't worth trying to do anything about it.
No one's going to be perfect, so you've pretty much got to decide what your own tolerances are.
-Morgan.