![The Simpsons mistake picture](/images/screenshots/313000-313999/313454_sm.jpg)
Burns Verkaufen der Kraftwerk - S3-E11
Continuity mistake: Moe opens the special Duff and foam appears down the bottle that disappears instantly. (00:05:10)
Audio problem: When Moe says "I'll talk to you tomorrow" to Homer, his mouth doesn't move. (00:15:15)
![The Simpsons mistake picture](/images/screenshots/313000-313999/313413_sm.jpg)
Continuity mistake: When Moe gets up on stage with Aerosmith you can see the big "Flaming Moe's" sign behind them. However in the close up the sign isn't visible. (00:13:30)
Audio problem: When Krusty arrives at the bar, Bernard says "Hey Krusty" but his mouth doesn't move. (00:11:00)
Continuity mistake: When Martin tells Bart about the answers being worthless, Bart is stood by the grass or the kerb depending on the shot. (00:04:00)
![The Simpsons mistake picture](/images/screenshots/313000-313999/313152_sm.jpg)
Other mistake: When watching TV at the start Homer's beer can just says D instead off Duff. (00:02:15)
![The Simpsons mistake picture](/images/screenshots/312000-312999/312952_sm.jpg)
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)
![The Simpsons mistake picture](/images/screenshots/312000-312999/312951_sm.jpg)
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)
Continuity mistake: When we see the big ape on the TV, the people running keep changing colour from black to white. (00:05:00)
![The Simpsons mistake picture](/images/screenshots/312000-312999/312949_sm.jpg)
Continuity mistake: When Homer puts Lisa's test on the fridge, a lot more papers appear on the fridge. (00:04:50)
![The Simpsons mistake picture](/images/screenshots/312000-312999/312745_sm.jpg)
Like Father, Like Klown - S3-E6
Other mistake: When Krusty leaves the Simpsons, The Front door is just an empty space missing all the details. (00:11:20)
![The Simpsons mistake picture](/images/screenshots/312000-312999/312742_sm.jpg)
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)
![The Simpsons mistake picture](/images/screenshots/312000-312999/312741_sm.jpg)
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)
![The Simpsons mistake picture](/images/screenshots/312000-312999/312740_sm.jpg)
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)
![The Simpsons mistake picture](/images/screenshots/312000-312999/312739_sm.jpg)
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)
![The Simpsons mistake picture](/images/screenshots/312000-312999/312738_sm.jpg)
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)
![The Simpsons mistake picture](/images/screenshots/312000-312999/312511_sm.jpg)
Other mistake: When the family are having dinner and Homer has a beer, the can is grey instead of the usual red. This is rectified a few seconds later. (00:14:00)
![The Simpsons mistake picture](/images/screenshots/312000-312999/312510_sm.jpg)
Continuity mistake: The zipper of Burns' radiation suit disappears instantly when he's on the phone to the news station. (00:06:20)
![The Simpsons mistake picture](/images/screenshots/312000-312999/312509_sm.jpg)
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)
![The Simpsons mistake picture](/images/screenshots/312000-312999/312507_sm.jpg)
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)
Answer: I'm not sure if this is the one you're thinking of, but an episode of "Ray Bradbury Theatre," called "A Sound of Thunder," dealt with a similar matter: a group of hunters travel back in time to hunt dinosaurs, only to find things have changed when they get back because someone stepped on a butterfly.
Xofer