The Simpsons (1989)

Marge on the Lam - S5-E6

Other mistake: When Homer and Chief Wiggum fall into the waste, in the second shot, the cliff edge looks very weird. It seems to be transparent with Ruth's car floating in mid-air, and there is a big curved wall that doesn't have ground at the top.

Kill the Alligator and Run - S11-E19

Continuity mistake: When Homer beats the train they are on a road, but then another train comes by and hits them right where the road was.

Bart's Inner Child - S5-E7

Revealing mistake: When everybody is in a big fight at the Do What You Feel Festival, watch out for a man in an orange shirt with black hair. His left eye keeps disappearing for one frame.

Bart the General - S1-E5

Continuity mistake: When Bart's army is attacking Nelson, there are a lot more kids attacking Nelson than there were training with Bart.

Bart After Dark - S8-E5

Continuity mistake: When the remote controlled plane crashes into the roof of the burlesque house, it is seen to hit only the side of the roof, yet when Bart goes to reclaim the plane, it is nested on the top of the roof.

New Kids on the Blecch - S12-E14

Continuity mistake: When Homer is pinching Lisa with the "jealousy bug", the sign behind him changes from a gift store to an antique store.

That '90s Show - S19-E11

Continuity mistake: When Marge is watching Homer's "Margarine" music video, the coffee in her cup keeps changing.

HOMR - S12-E9

Continuity mistake: When Homer sits down in the movie theater, all the rows are completely full, including the row behind him. When he turns around to talk to Selma, the seats directly behind him are empty. Then, when Homer turns back to the screen, the Sea Captain and Dr. Hibbert appear sitting directly behind him.

Tree House of Horror VII - S8-E1

Continuity mistake: In 'The Genesis Tub,' Lisa sits on a tooth-throne in the tub, which has red cloth draped over the arms with gold tassels around the edge. However when Bart comes to take the tub, Lisa stands up on the throne and yells "Bart, no!" In this shot the tassels are gone. (00:17:45)

Hamster

Mayored to the Mob - S10-E9

Audio problem: At the theatre, when the cook talks to Mark Hamill off-stage he sounds exactly like Moe the bartender.

Krusty Gets Busted - S1-E12

Continuity mistake: When Sideshow Bob is shouting and screaming just before he is taken away in a police van, Lisa and Bart swap places right before Bart says "Take him away, boys."

Homer vs. Dignity - S12-E5

Plot hole: In the last part of the episode, when Mr Burns is trying to convince Homer on his float to play a big prank, the timing is totally wrong. Firstly, Lisa sees the writing 'Happy Pranksgiving' on the side of Mr Burns' float way before it reaches her, and it takes Mr Burns ages to change into the Father Christmas outfit.

Lisa's Rival - S6-E2

Continuity mistake: The position of Ralph's Star Wars action figures changes the two times they show his diorama.

Stark Raving Dad - S3-E1

Other mistake: There are two mistakes when Bart calls the Krusty Hotline: 1, The cereal box says the phone number is '1-909-O-U-KLOWN.' Bart presses eight buttons on the phone. 2, as he is dialing, you can HEAR seven buttons being pressed. (00:01:45)

There's No Disgrace Like Home - S1-E4

Other mistake: When Homer is at Moe's, there is a boxing match happening on TV. There is a bald guy who is getting considerably battered by the opponent and gets knocked out, and then for some absurd reason he is victoriously standing as if he had won.

Bart Gets An F - S2-E1

Revealing mistake: When there is a zoom in of the house just before Bart gets up late, it has the old arch-shaped windows, but in the rest of the episode it has the normal windows. It's obviously a screen from Season 1.

Large Marge - S14-E4

Factual error: In Luigi's, the lobsters in the tank are bright red. They are actually quite dark brown until they are boiled when they become red/pink.

The Simpsons Christmas Special: Simpsons Roasting on an Open Fire - S1-E1

Continuity mistake: During the family's breakfast, in most shots Marge sits right beside Maggie's highchair, but in certain close-ups they are quite a few feet away from one another. (00:05:25)

Super Grover

The Simpsons Halloween Special: Tree House of Horror - S2-E3

Continuity mistake: When Homer is preparing the barbecue, he is wearing an apron that says "Mafia staff apron". After he goes to pick up the lighter fluid, it reads "Maffia staff apron", and after he has lit the barbecue, it is back to saying "Mafia".

Two Cars in Every Garage and Three Eyes on Every Fish - S2-E4

Continuity mistake: The shot glass that Burns places on his desk disappears for several frames before reappearing. (00:05:45)