Vampire Bats and Scaredy Cats - S2-E2
Continuity mistake: When Lisa's uncle shows her her grand-father's picture, it changes from one shot to another.
Diana Ross - S4-E23
Continuity mistake: When Diana Ross finishes her first song, the bird has both his feet on the ground; in the next shot, the bird has one leg raised, without enough time passing to do so. (00:08:45)
Continuity mistake: Lenny wears an Army jacket and wears a bandage around his hand because of something he did in the Army Reserve. Unfortunately, he doesn't join the Army Reserve until the next episode.
Continuity mistake: When Mat knocks out the door, which falls on Pat and squeezes him, he uses a hand pump to inflate him. After Pat comes to life, the hand pump disappears.