In "The Stakeout" when Jerry and George stake out an office building to try and find a girl Jerry met at a party with Elaine, Jerry's Mom and Dad come to visit. I do beleive this was like the 2nd episode or something, so the show may not have been completely planned out, but here it goes..... Jerry comes home and his mom and dad are in his sofa bed. When his mom keeps saying she'll go to a motel Jerry says he is going to sleep at Kramer's. The sofa bed was in the living room! Didn't Jerry have a bed in his room? Do they ever show his room?
I also noticed less furniture in the apartment as well as a somewhat different kitchen setup and no cereal boxes. No bike. Kramer's hair wasn't as tall and George wasn't as bald. I do beleive the computer was missing too.
--Todd