When Bart is in the changing rooms, there are two security guards watching the changing room cameras, one with Gray hair, one with brown hair, however in the last shot as they grab their guns and make an exit to pursuit, both men's hair are now identical colour.
When Lisa gives her speech at school, Miss Hoover has only one leg. Miss Hoover actually has her other foot against the desk as you can see part of her other shoe.
A football forecaster declares Cincinnati his "Shoe-In of the Week." The correct spelling is "shoo-in."