In the ending credits, Julie Kavner is credited for playing Patty and Selma, even though the scene those characters appeared in was cut from the film and only appears on the DVD deleted scenes section. See more...
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Continuity: In the scene where Mayor Quimby says "To make sure this wall is completely idiot-proof...Cletus", in a far shot, Cletus comes walking up with his hands empty. It then cuts to a close up and now you can see the opossum tail in Cletus' right hand. There is no time for him to have grabbed it from anywhere.
Continuity: In front of Krusty Burger, when Lou carries a naked Bart to the sign post, the post is embedded directly in the concrete walkway slab, just beside the left corner of the patch of grass. Once Bart is cuffed, the sign post has actually moved down about 4 feet, and is also now embedded directly in the grass at the right corner. In following shots, it's at the left corner of the grass and then right again.
Continuity: When President Schwarzenegger tells Russ Cargill he will have to go back to making family movies, there is a "Diaper Genie" promo poster on the Oval Office wall and on the immediate left of President Schwarzenegger's desk. But the promo poster disappears and the walls of the Oval Office become further from the desk in the next long shots.
Continuity: When Homer is grooming Spider Pig he is in Bart's room and it's on the end of the house because you can see the corner of the house, then he walks out of the room and goes in another room but that room is on the end of the house too, you can tell it's a different room by looking in the background so it doesn't make sense that both rooms are in the same place.
Continuity: When Grandpa is freaking out in church, he says, "twisted tail" while kneeling with his hands cupped, "a thousand eyes" leaning up against a pew, and "trapped forever" standing up and spinning. On Comic Book Guy's cell phone video he says all of these on the floor rolling around. He's also saying it faster on the cell phone video.
Continuity: When Maggie does her disappearing act through the sinkhole, and Marge rushes to get Homer, the wooden porch swing is directly in front of the window, with its top beam as high as the top of the window. When Homer says, "This dome can play tricks on you," note the door and window behind Marge, because the swing is now gone.
Continuity: During Bart's flashback of him and Homer fishing, Homer drops the bug zapper into the lake. Dozens of fish come floating to the surface all over the lake. After the shot where Homer scoops up a fish and is zapped for it, there's a reverse-angle shot of Bart with no dead fish in the lake around him.
Continuity: When Homer dumps the silo in the lake, there are the words "Pig Crap" on the front and there is no writing on the back. However, when Lou and Eddie find the silo later in the movie, the "Pig Crap" words are there, but the words saying "Return To Homer Simpson, No Reward" has appeared out of nowhere.
Continuity: When Homer leaves the bar Eski-Moes (in Alaska), he catches hold of a truck, which propels him up the hill in front of his cabin. However, he runs outside a few minutes later and floats away on the heart-shaped iceberg, which has suddenly appeared on a lake that was never there before. The road that the truck was on earlier is gone.
Deliberate "mistake": The Simpsons enter a motel (Red Rash Inn) to hide, and it's clear from the outside that the building is only one story high. But when Homer flings back the curtains to reveal the buildings and billboards, it appears that the motel room is located on a much higher floor, since the view seems to be level with the building tops.
Continuity: Homer leaves Eski-Moe's with nothing in his hand. Then he grabs onto the back of a truck with still nothing in his hand. Homer lets go of the truck and zooms to the house and there's still nothing in his hand. But when he opens the door, there's suddenly a bouquet of flowers in his hand.
Continuity: When the Simpsons are driving to Alaska, Homer puts the poster of Alaska on the window. Marge then removes the poster and we see the van is going out of control. But in the next shot where we can see their faces, we can see they are driving totally normally, judging by the view outside the back window.
Continuity: 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.
Continuity: 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 4 other people standing around the lamp post too. But when Homer arrives in shot (a second later), Nelson, his mother and the 4 other people have magically disappeared.
Other: 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.
Continuity: 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.
Continuity: When Bart skateboards to Krusty Burger naked, he passes Agnes Skinner in the middle of town. On the left side of the screen is Mr. Largo, the school music teacher. A few shots later, when Bart approaches KB, Mr. Largo is seen walking down the sidewalk. There is no way he could have caught up and passed Bart in that time span. Not only that, but he and Bart are headed in completely different directions.
Plot hole: There are two cars driving behind the EPA truck containing Marge, Bart, Lisa and Maggie. But when Homer uses the bulldozer to try and break the family out the truck, the two cars behind the truck don't even realize for some strange reason that a bulldozer is trying to destroy the truck. There's no way they couldn't have not seen the bulldozer since they were just behind it.
Continuity: 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.