In one scene, Mike and Carol are playing Scrabble on the table in the family room. The interesting thing: They are doing so without the benefit of a Scrabble board or even letter trays. Mike just has his tiles face down in a row in front of him and Carol's are randomly distributed on the table. A few words have already been played in the center of the table, but again, no board.
Whenever Greg and Marcia are in Sam's Butcher Shop, Greg is wearing the same shirt he wore in the "The Cincinnati Kids".