At 20:33, the bullies, Dolph, Jimbo and Kearny are seen stealing bumper cars from Duff Gardens. Jimbo's bumper car goes from blue in one shot, to green the next shot.
Marge hands Homer a videotape. When Homer reads the title, he is holding the tape. In the next shot, where Marge lists an actor, she is holding the tape. When Homer says, "Woo-hoo!" it is back to Homer holding the tape.
Aunt Gladys is referred to as Gladys Bouvier which is extremely unlikely since Bouvier is her sister Jacqueline's married name.