Lisa is writing I WILL NOT DO MATH IN CLASS on the board. She stops after writing MATH. In the next shot an IN has appeared.
When the Funzo decapitates Lisa's Malibu Stacy and Bart's Krusty-doll, the Christmas tree in the background can be seen disappearing and reappearing between shots. In the same shot without the Christmas tree the streets don't have snow as seen through the window, but when Bart and Lisa exit the house there is snow.
When Bart and Milhouse are jumping on Homer and Marge's bed while dressed in drag, the mirror and dresser next to the bedroom door is missing. It only appears when Bart falls off the side of the bed and cracks his coccyx on a bowling ball.
Although parents were worried about their children because Springfield Elementary School closed down, nobody considered enrolling them in other schools.