I see where you're coming from, but I think it makes sense to have characters first names as acceptable answers but full names or surnames as the answers for the actors. it's consistent with all the other quizzes when answering real person names.
I've possibly watched a grand total of one Friends episode from start to finish and maybe caught snippets here and there otherwise, yet somehow I got all of this. I wonder what other information my brain is retaining that has absolutely zero bearing on my life.
I usually start with last names only and got all the actors that way. It also works for the characters...to a point. I typed Geller several times and it wouldn't take, before going with Ross and Monica.
the rest i answered quite quickly but it took me ages to remember Matthew Perry ... i can never remember his real name ... lol ... got there in the end