The Simpsons ( 1989 )

Continuity mistake: When Homer reveals the murderer in the story, he is holding a card in his right hand. When Booth tells Homer he has given away the game, the card has disappeared.

Continuity mistake: At the beginning of the episode, the mat on the front doorstep is purple. Later on, when we see Lisa arrive home on her bike, it is now green.

Continuity mistake: When Marge and Maggie check out their groceries at the supermarket, the cashier says that she requires a price check on Gramma Shortcut's Store Bought Bundt Cake. The position of the cake on the scanner changes between shots.

Continuity mistake: In a full view of the checkout, when the cashier requires a price check on Gramma's Shortcut Store Bought Bundt Cake, you can see beside Marge there is a stand and there is a man with a beard and glasses behind it. When we see Marge in the next shot, the man is now standing behind her, and there is also a couple who weren't there previously.

Continuity mistake: When Marge puts down a dollar note on the scanner and takes the cake before leaving the supermarket with Maggie, the position of the dollar note on the scanner changes between shots.

Continuity mistake: When the man is talking to the cashier in the supermarket after Marge and Maggie left, there is a dollar bill on the scanner. When the cashier tells him to "shut up", the dollar bill has gone.

Continuity mistake: In a full view of Ear Poison on the stage at the block party, there are two guitarists next to the drummer, who were not next to him in the previous shot.

Continuity mistake: When Marge and Homer are in bed, Homer puts down his glasses when she asks him why they don't have any couples' friends. When Marge says "I want friends!", we cut back to Homer and his glasses are nowhere to be seen.

Continuity mistake: When Homer comes into the kitchen after Marge turned on the food mixer and got the room covered in mixture, you can see there is mixture in Marge's hair, but when we see her in the next shot, the mixture has gone.

Lisa the Vegetarian - S7-E5

Continuity mistake: In the cafeteria scene, the shots from Lisa's perspective show glass protectors with signs where the food is. However, when the shot switches to Lunch lady Doris' perspective, the protectors are gone.

Treehouse of Horror XVIII - S19-E5

Continuity mistake: When Marge shoots Chief Wiggum, the arrow goes through his tie. When they roll on top of him, the arrow isn't through the tie anymore.

Bishop73

Continuity mistake: The door to Mrs. Krabappel's classroom has a window, but when Bart fakes being sick then walks out of the class (we see the desks as the door closes), the door's window has vanished, and the doorknob has switched sides as well. Additionally, earlier, when Bart deliberately falls off his chair in class, note that one of the bars on the back of his chair has gone missing.

Please Homer, Don't Hammer 'Em - S18-E3

Continuity mistake: As the workmen begin to leave site after hearing that Homer is unable to pay them, a couple of tools are dropped on the ground; however, in the following shot, facing back towards the cabinet where Homer is hiding, the tools have disappeared.

Continuity mistake: After Mrs. Krabappel asks Bart to name the pirate in Treasure Island, when it cuts to a closeup of Bart we see the set of blue books have vanished from Mrs. Krabappel's desk, and a Krusty mug has suddenly appeared there.

Continuity mistake: When Bart fails the test despite having actually studied, we see the two red "X" marks in the center row of the multiple choice questions, but after Mrs. Krabappel passes Bart because he applied practical knowledge, when Homer hangs the test up on the fridge those two "X" marks in the center have vanished.

Continuity mistake: Bart's bedroom is on the opposite side of the stairs, with his window facing out to the backyard, but after his prayer his bedroom window is facing the front of the house. Additionally, the style of his window changes as well, going from two horizontal sliding panes with no muntins, to a vertical sliding window with two muntins when Marge pulls the curtain back, then to a having only one muntin when Bart opens his window.

Continuity mistake: When Bart is called up to give his oral book report keep your eye on Bart's book, Treasure Island, and the direction of its binding. The book's binding should be to the left of the front cover, which has the picture of a pirate wearing a black hat, but the binding changes to the right side (note the cover picture/title) of the cover at times, and when he mentions the publisher the book also changes how it's held by Bart.