Greg saves Bobby's life in the eposide big little man.
When Bobby is locked in the closet pounding the door to get out, there's a robe and a shirt hung on the closet wall right behind him. When Peter finally opens the door to let him out, the shirt and robe are nowhere to be seen on that wall.
In the scene where the girls are talking with Mike about their selection of the yellow wallpaper, Jan is shown holding the wallpaper against the wall. We're then shown Cindy rolling up the paper while Jan is holding the corner edge. But then we're shown Jan still holding up the paper against the wall (not the edge) even though presumably Cindy would've rolled up the paper by now.
In the opening sequence, after the ladder falls, there is a shot of Peter on the grass clear of the ladder. In the next shot, we're shown the ladder on the ground with the pots underneath it with Peter nowhere in sight. And in the next shot, we're shown Peter on the grass with his leg under the ladder, whereas earlier Peter and the ladder were nowhere near each other. Also in the shot of the ladder by itself on the ground, there is no garden hose anywhere near it. Yet after all is said and done, the garden hose is then shown on top of the OTHER leg of the ladder from where it originally started. Finally, as the paint falls on Bobby, there is no trowel on the grass, whereas in an earlier shot, it was right next to his feet where Peter was working.
When Bobby asks the girls where they are going, they say they are going to sleep over a friend's house because of the wallpaper smell. However, they aren't carrying any overnight bags or sleeping bags - not even a purse. Therefore, they brought no pajamas, toiletries, etc. to the sleep over - just the clothes on their backs.
Bobby: Well, what about..the fire?
Peter: What fire?
Bobby: The one that could have occured fom spontaneous combustion. The closet is filled with smoke..and then you bust in and save me!
This is the episode where the girls' room is redecorated to its new yellow paint and floral wallpaper. However, if you look all the way back to Season 2 "Impractical Joker"; the closeups of the lavendar baseboards showed they were already looking pretty shabby when Myron the mouse gnawed his way out of the hamper Jan dropped him in!
This is the only episode where we hear a toilet flushing. The flush happened three years after we heard Archie Bunker's toilet flush on All in the Family.