Other mistake: When Homer pretends to read the newspaper, the back page is very noticeably blank and missing any print. (00:08:00)
Continuity mistake: During the musical number about Mr. Burns, Homer and Marge swap sides of the table. (00:05:40)
Revealing mistake: At the start when we see stuff falling off the roof, the animation for the swings in the background simply fade out and are incomplete. (00:02:05)
Itchy and Scratchy: The Movie - S4-E6
Continuity mistake: When Bart places his money on the kiosk, the end of the note is overhanging the edge of the kiosk. When he grabs his money after being refused entry, the entire note is on the kiosk. (00:19:20)
Itchy and Scratchy: The Movie - S4-E6
Continuity mistake: When Bart tries to buy a ticket to Itchy and Scratchy, the booth is unoccupied. When the shot changes the man has appeared in the booth. (00:19:20)
Itchy and Scratchy: The Movie - S4-E6
Revealing mistake: When Nelson blinks right before Milhouse says "No one who saw the movie would say that", Nelson's right eyelid is white for some reason. (00:18:20)
Itchy and Scratchy: The Movie - S4-E6
Continuity mistake: Homer rips up Bart's ticket and the bits land on the floor. Only to simply vanish into thin air. (00:15:20)
Itchy and Scratchy: The Movie - S4-E6
Continuity mistake: When Bart is looking for food in his bedroom, he throws a book towards Santa's Little Helper. The position of this book and it's pages changes between consecutive shots. (00:08:20)
Itchy and Scratchy: The Movie - S4-E6
Revealing mistake: When Marge says she's sure Bart doesn't mean to be bad, her necklace flashes through her neck. (00:03:40)
Tree House of Horror III: The Simpson's Halloween Special III - S4-E5
Continuity mistake: In King Homer, When Burns is telling the reporters what the ape will be doing, the crowd in the background are devoid of any facial features. (00:11:40)
Continuity mistake: Homer says he's had the best day by not going to church. When he does, Marge has Maggie in her arms. When the camera changes to behind, you can see she no longer is holding Maggie. (00:07:45)
Continuity mistake: Homer asks the family how church was. When he does, Marge grabs her nose. Camera cuts and she is no longer holding her nose. (00:07:30)
Continuity mistake: When Homer spots the penny, he moves his foot and there is nothing on the floor. When the shot changes, the penny has appeared. (00:06:50)
A Streetcar Named Marge - S4-E2
Continuity mistake: When Maggie is looking down at the desk to see the keys, there is a book on the desk as well. When she's looking down at the adult walking into the room the book has gone. (00:14:00)
A Streetcar Named Marge - S4-E2
Continuity mistake: Otto's tattoo changes from the close up and the long shot of him when auditioning for Stanley. Note the eyeballs. In the first shot they are past the top hat. In the following they are much further back. (00:05:30)
A Streetcar Named Marge - S4-E2
Continuity mistake: Just as Marge heads out for her 1st audition, the kids go from lying on the sofa to sat up instantly. (00:03:35)
A Streetcar Named Marge - S4-E2
Continuity mistake: When Homer picks up the snacks from the vending machine, 2 items are left on the floor. When Marge is practising her lines a few shots later, the items have disappeared. (00:11:10)
A Streetcar Named Marge - S4-E2
Continuity mistake: When Marge walks across the living room she has a bag in her hand which disappears when the camera changes. (00:03:35)
Kamp Krusty - S4-E1
Continuity mistake: At the breakfast table, Homers plate of food changes entirely between shots. (00:02:50)
Continuity mistake: When Krusty appears on stage he has a microphone that vanishes from his hands when he claps at the end of the song. (00:13:10)
Answer: Willy referred to an encounter he believed he had with actual aliens, while Wiggum thought he was referring to the arcade game.