Revealing mistake: After Homer knocks out the guard guarding the dome, Homer runs into the supplies shack. As he walks through the doorway, his right arm passes through it.
The Simpsons Movie (2007)
1 revealing mistake - chronological order
Directed by: David Silverman
Starring: Hank Azaria, Albert Brooks, Nancy Cartwright, Dan Castellaneta, Julie Kavner, Harry Shearer, Yeardley Smith
Continuity mistake: When "Emperor" Moe appears in front of Marge, after she and the kids return, the two cartridge belts swung over Moe's shoulders switch from his left over the right, to his right over the left. (01:04:50)
More trivia for The Simpsons Movie
Question: In the scene, where Lenny informs Homer that they're giving away free donuts at the shop and that they're going very fast, why didn't Homer ask Lenny to save him some? If he did and Lenny agreed, Homer wouldn't have to hurry up nor dump silo in the lake, thus the dome situation could have been avoided.
Answer: Homer has been known not to make the smartest decisions, and the decisions he does make, he makes without fully thinking them through. Clearly he wanted to get some donuts as quickly as possible without thinking of any other ways, so he decided to ditch the silo in the lake as it would be the fastest way of getting it off his back, even if it's not the smartest. Also, putting that aside, he likely wanted his own pick of the donuts rather than have Lenny guess what he wanted.
Casual Person