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)
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)
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)
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.
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.
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.
Continuity mistake: When Green Day finishes, in one shot the dice on the drums are gone, but the next shot, they are back on the drums. (00:02:50)
Continuity mistake: When Grandpa is freaking out in the church, at the point where he says "Trapped forever", Kirk (Milhouse's dad) is sitting normally. In the next shot, his arm is now holding onto the top of the seat. (00:05:40)
Continuity mistake: When Homer slides down the rope hitting people off it, Barney gets hit and falls to the side. A few seconds later the bomb falls down and Barney is standing up ready to catch it.
Continuity mistake: When the mob approaches Homer's house, it is undamaged. However, a few seconds later when everyone is out of the house, it is suddenly ablaze, and it is clear that it's falling apart. But when the sink hole sucks the house in a few minutes later it is undamaged, and no evidence of a fire is visible. (00:32:50)
Continuity mistake: When the dome is being placed over the town, the church and Moe's Bar are shown right next to each other, but later on in the film, when Barney runs out of the Alcoholics Anonymous meeting at the church, Moe's Bar is nowhere to be seen. (00:26:30 - 00:48:30)
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