The Wonder years is a very realistic serie, but some things are not very realistic.
I think the scene in the pilot where that seventh grader with a beard use Kevin's locker to put a knive and drugs in it, isn't very realistic, because that guy can never be a seventh grader and i don't think they put that stuff in lockers of seventh graders?
I think Wayne is to much a butthead, he hits Kevin almost every day. In real life i think Kevin wouldn't be so happy and optimistic if that happened every day.
Do you known more things which aren't realistic?