Continuity mistake: When Maggie jumps into the sink hole whilst the mob are invading, Drederick Tatum (the Mike Tyson parody character) is seen standing directly in front of the dome. But after Marge, Bart and Lisa have jumped into the sink hole and it cuts to a wide shot, Drederick Tatum is seen a lot further away from the sink hole than he was previously - look closely to the right of screen in the wide shot, that's where Tatum is. (00:35:35)
Continuity mistake: When the dome is placed over the town and Marge says "Trapped forever, it's all coming true" we can see a hose on the garden tap in the background. But a couple shots previously we could only see the garden tap but no hose. (00:27:10)
Revealing mistake: When Moe is emptying the beer bottles into the lake, his face is seen turning around without any animation. (00:19:20)
Continuity mistake: At the start of the scene where Lisa is describing Colin to Marge, there is water on the floor Marge uses to clean the pig tracks on the floor with. In the next shot, there is suddenly a lot more water on the floor than there was in the previous shot. (00:17:50)
Continuity mistake: When Ned offers Bart some cocoa, we can see the cocoa is the only thing in his hand. Then in the next shot, some whipped cream has appeared in his hand out of nowhere. (00:17:25)
Continuity mistake: When Bart is handcuffed to the lamp post, Nelson is stood in front of Bart laughing at him, then Nelson's mother walks into shot and she starts laughing at him too. There are also four other people standing around the lamp post too. When Homer arrives a second later, Nelson, his mother and the four other people have magically disappeared. (00:13:05)
Other mistake: When Homer falls through the roof into the house we see Grandpa sitting somewhere other than the ground floor or the second floor. The problem is the Simpsons' house has an attic on top of the second floor and below the roof. The length of the attic's floor and the house around it are totally the same, so really what we should have seen was the attic, not Grandpa sitting somewhere. (00:08:25)
Audio problem: A little bit before Reverend Lovejoy says he's going to call on someone, the church organ is being played. But as the camera pans around to Lovejoy, we can see the woman is not touching the organ keys, but the sound is still heard. (00:04:45)
Continuity mistake: When Green Day start playing the violin when the barge is sinking, their feet are below the water. In the following shot, their feet are suddenly above the water. (00:03:45)
Continuity mistake: At the end when everyone is cheering at Homer and Homer notices Marge, Lenny and Carl are in three places at once. First, just as Homer starts his bike to get Marge, Lenny and Carl are right behind him. Second, just after Homer carries Marge on to the motorbike Lenny and Carl are behind Homer without enough time to move. Third, just as Homer and Marge drive off in the motorbike, Lenny and Carl are now in front of Homer without enough time to move. (01:13:20)
Revealing mistake: When Grandpa is being rolled out of the church, everyone is looking at him. As this happens, look closely at the Squeaky Voiced Teen sitting next to Hans Moleman on the right hand side of the church. As he turns his head around you'll see his eyes disappear as he stops turning his head. (00:06:05)
Continuity mistake: The lines in the gutter keep changing when Bart is hanging off the roof. (00:08:20)
Continuity mistake: When Homer slides down the rope hitting people off it he doesn't hit Lenny even though Lenny was on the rope before.
Continuity mistake: When Bart and Lisa are looking at the cabin from a hill, the cabin only has a shallow incline to the water, but in a later scene, when Homer goes to look for his family, there's a significant slope.
Continuity mistake: When the family are in Alaska, Homer comes in with logs and Bart claps his hands to get snow on him. When Homer says Lisa should clap too, his hair changes.
Other mistake: When Marge is watching the recording of Grandpa on the cell phone, the camera changes positions suddenly after he says "Trapped forever." How could an old-fashioned flip phone pause like that? Also, in the 2nd view, it shows a floor-to-subject camera angle - the only way that could be possible is if there is a hole in the floor and someone's recording through it. (00:10:46)
Continuity mistake: There's a tiled patio at the back of the house with a total of twelve large tiles, but when the house goes down the sinkhole there are sixteen tiles in total. Plus the fact that when Bart's on the roof hanging from the gutter the tiles below are white (they also appear white when the house falls into the sinkhole), but when the dome is placed over Springfield the tiles are brownish-orange.
Other mistake: When Homer kicks over the bomb, the time on the bomb decreases by half. Because of this, Krusty yells "Get outta here!" to Homer. However, Homer was standing in front of the bomb and Krusty was standing behind Homer, which means Krusty's view of the bomb was completely blocked, so he couldn't possibly have seen the bomb lose half of its time. He was definitely reacting to bomb losing half of its time, as he is shown looking straight at it just before he starts yelling at Homer.
Continuity mistake: Cletus is shown on a roof attempting to distract Cargill as the group was trying to climb the rope, and is still there when Cargill turns off the transmission between Springfield and Cargill. Yet when Homer says "I can't do anything right" a few minutes, Cletus is suddenly shown in the background behind Homer.
Other mistake: When Homer is sliding down the rope, he knocks off several people climbing up. These people are never shown landing on the ground.
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