Continuity mistake: When Bart gets off the bus there is a fire hydrant behind him. When we see the bus drive off the hydrant has gone. (00:07:10)
Ssiscool
Continuity mistake: When Bart gets on the bus the day of the test, Milhouse is sitting at The Front of the bus. When we see Sherri and Terri looking at Bart, Milhouse has gone. (00:06:30)
Ssiscool Continuity mistake: When we see the big ape on the TV, the people running keep changing colour from black to white. (00:05:00)
Ssiscool 
Continuity mistake: When Homer puts Lisa's test on the fridge, a lot more papers appear on the fridge. (00:04:50)
Ssiscool 
Like Father, Like Klown - S3-E6
Continuity mistake: At the end of Krusty's story the candles have burnt themselves out on the table. However in the next shot they are alight again. (00:10:05)
Ssiscool 
Like Father, Like Klown - S3-E6
Continuity mistake: Towards the end of the meal, Lisa has some meat left on her plate that disappears in some shots completely. (00:06:55)
Ssiscool 
Like Father, Like Klown - S3-E6
Continuity mistake: When talking about Jewish people, Homer puts mashed potatoes on his plate that sometime disappear and reappear. (00:06:30)
Ssiscool 
Like Father, Like Klown - S3-E6
Continuity mistake: Lisa says about Krusty being Jewish and Homer's wine glass swaps side on the table. (00:06:20)
Ssiscool 
Like Father, Like Klown - S3-E6
Continuity mistake: Homer asks if Krusty is going to eat his meatloaf and is reaching across the table as he does so. The camera changes and he is no longer reaching. (00:06:50)
Ssiscool 
Continuity mistake: The zipper of Burns' radiation suit disappears instantly when he's on the phone to the news station. (00:06:20)
Ssiscool 
Continuity mistake: Milhouse unwraps his present from Bart and the wrapping paper stays under the box. When he's seen a few seconds later however the paper has gone. (00:01:50)
Ssiscool 
Continuity mistake: When Bart is writing the card for Milhouse, he is writing on the right hand side of the card. This changes to the left hand side in the close up. (00:01:10)
Ssiscool Continuity mistake: When playing Monopoly the fold in the board is level with the P. Camera changes now the fold is before the O. (00:16:10)
Ssiscool 
Continuity mistake: Maggie spits a hotel out on to the board which disappears a few seconds later. (00:16:15)
Ssiscool 
Continuity mistake: When Burns hangs up the phone to Kent Brockman, his name tag on his radiation suit disappears. (00:10:20)
Ssiscool 
Continuity mistake: When the purple jam pops on the core temperature dial, it leaves some residue on the dial which has disappeared in the very next shot. (00:05:10)
Ssiscool 
Continuity mistake: When Homer is talking to Lenny and Carl about the movie his pink doughnut disappears from his hand. (00:03:45)
Ssiscool 
Continuity mistake: The colour of Bart's plate at the BBQ changes between shots. It goes from dark blue to light blue. (00:07:40)
Ssiscool 
Continuity mistake: When Homer and Ned are talking after Homer tries to return the BBQ, the BBQ moves place on the lawn. Note the stepping stones. (00:17:40)
Ssiscool 
Answer: Willy referred to an encounter he believed he had with actual aliens, while Wiggum thought he was referring to the arcade game.