[quote=@BrokenPromise]I guess I'm the only person who approaches a fan RP and thinks "Okay, I really hope the GM doesn't screw up how X acts, gets Y correct, and chooses not to acknowledge the existence of that horrible Z movie! 
[/quote]
Nah, I think that all the time when I see certain fandom roleplays that don't retcon such characters. That seems more commonly a fanfic gripe, though.