- Errors in geography: The face masks in the medicine woman's shelter and the totem poles are not part of Inuit culture. They belong to the Haida Indian tribe who reside much further South down the British Columbia West Coast and the South East area of Alaska in the temperate rain forests.
- Continuity: In the scene when Homer returns to the hotel room, as the screen pans from left to right, Maggie's eyes are noticeably dropped from eye to nose level.
- Continuity: At the start of the movie the church is shown set back from the street (correctly), in later scenes it is shown right by the road, next door to Moe's Tavern.
- Continuity: In the Motel scene many times, you can see that the lock chain slot on the door doesn't have the circle where you put the chain through. It has it in a few shots but than in others it is a straight rectangle.
- Continuity: While giving his report on intermittent blackouts throughout the town Kent Brockman's eyebrows are missing.
- Continuity: When Homer is dressed as General Marriot Suites he's wearing white gloves but after he punches the guard the gloves have vanished.
- Revealing mistakes: When Russ Cargill appears on the dome over Springfield for the first time, watch the crowd on the bottom of the screen. One citizen's hair was not colored in and is transparent.
- Continuity: When they flee the house and jump into the car, the house is on fire, even when Marge runs back into the house to save her and Homer's wedding video, it is on fire. When the townspeople carry the car to the backyard, the house is not on fire.
- Continuity: When the family move to Alaska, the door to their cabin opens to the left (looking at it from the inside) when Homer escapes from Bart and Lisa's "avalanche". But later in the film it opens to the right (from the inside).
- Continuity: When Marge closes the curtain in the motel room the other curtain changes from being open and closed between shots.
- Continuity: When Homer attempts to ride around the metal ball, at first the motorcycle has flames painted on it, and in the next shot the flames are gone, and then show up again.
- Audio/visual unsynchronized: When Green Day's barge begins to sink, they all pull out violins. However, when they start to play, you hear a cello as well.
- Continuity: When Homer dumps the "Pig Crap" silo into Springfield lake, he drives through a load of signs and the concrete fence. When he has dumped the silo and drives away the signs have all gone.
- Continuity: When Homer dumps his silo of pig waste into Lake Springfield, he cuts the ropes with an axe, and dents the side of the car. The dent is gone in all subsequent frames.
- Continuity: When Russ Cargil is speaking to the town of Springfield on the big screen, on the top left hand corner you can see the Simpsons house with the dome turning on an angle cutting half way through the yard, but in other shots it is perfectly straight right at the back of the yard.
- Continuity: Size of the hole atop the dome.
- Continuity: In one scene, Lisa's clipboard is seen from the top with a sheet of paper on it. In the following shot when she snaps it in half, the paper is gone.
- Revealing mistakes: When the crowd of Springfield citizens is searching for Homer, Groundskeeper Willie (who is in the front row) does not have any shading around him while the rest do.
- Continuity: When Bart is looking at Homer trying to eat the fish that he just took out of the lake, all of the other dead fish floating on the surface are gone.
- Continuity: When Marge and Bart are inside the gas station store while Homer puts gas in the pickup truck, Bart places a buzz cola on the counter next to the beef jerky. When Bart aims his sling-shot to shoot the hot dog off Homers' hand, the buzz cola is now near the tip jar. After he shoots the hot dog, the buzz cola is gone.
- Continuity: During the avalanche scene, Homer is carrying 4 logs, then 3 logs, then 4 logs again.
- Revealing mistakes: Some footprints of Homer's pig start to appear on the ceiling without being created by the pig's hooves.
- Continuity: In the scene with Cargill is in the Oval Office, the portraits change. At first, the pictures are of Ronald Reagan and assumably, Maria Schriver. In the next shot, the portraits have been replaced by a mountain landscape scene.
- Continuity: When Mayor Quimby call Cletus over to check the barrier around Springfield Lake, you can briefly see that Cletus has nothing in his hands, then a second later, he's carrying a possum.
- Revealing mistakes: When Bart is aiming his slingshot at Homer, you can clearly see there is no stone in it.
- Continuity: When Lisa is visiting the neighborhood’s houses with the petition to stop dumping in Lake Springfield, she comes to Milhouse' house, his lawn is empty but in the next scene there is a large rock in the middle of his lawn.
- Continuity: The Simpsons’ new home in Alaska changes location from: beside the sea next to a mountain to overlooking the sea beside a forest.
- Revealing mistakes: When Homer gets hit by a wrecking ball between ''a rock'' and ''A Hard Place'' the wrecking ball comes down from the sky and does not seem to be attached to anything.
- Continuity: During the Church scene when Flanders is confessing to the immodest sense of pride; Chief Wiggum is clearly sitting behind Flanders. However, when Grandpa Simpson is doing his monologue of warning, Chief Wiggum seen on the other side of the church.
- Continuity: When the Simpsons jump from the tree house into the sinkhole, they jump feet first. They come out the other side of the dome head first. They should have come out feet first.
- Continuity: When the squirrel comes out of the polluted lake, he has eighteen eyes, arranged in four rows - 3, 4, 5, and 6. However, when the EPA comes to take the squirrel away as Flanders and Bart are hiking, the squirrel has five rows of eyes.
- Continuity: At the start when Green Day is playing, the Duff blimp is visible moving slowly in the background. When the camera pans out, you can see the horizon and no blimp is visible.
- Factual errors: Homer pulls an orange "Get Out of Jail Free" Monopoly Community Chest card from his wallet. In an American Monopoly set, Community Chest cards are yellow. Chance cards are orange.
- Continuity: When Doctor Hibbert asks Mister Burns for power supply for the hospitals, Mister Burns writes it down using his right hand but in "The Simpsons" TV show, Mister Burns is supposed to be left-handed.
- Continuity: When Russ Cargil is talking to Springfield for the first time, he says that he trapped them like carrots. You see Moe standing next to Lenny and Carl, who then nod their heads at each other. 6 seconds later, Moe is standing alone at the back of the crowd.
- Continuity: The medicine woman and Homer don't introduce themselves - since Homer is unconscious when we first see her - yet when she attempts to revive him she calls out his full name.
- Continuity: When Lisa is standing outside the dome talking to Colin she puts her left hand on the glass, but after she punches Bart she puts her right hand on the glass.
- Continuity: When Homer takes a bite out of the burger he orders he gets crumbs in his beard but in the next shot the crumbs are gone
- Errors made by characters (possibly deliberate errors by the filmmakers): When Lisa and Colin meet he is standing in front of her but after the camera zooms in and out on Lisa, Colin is standing next to her.
- Continuity: When the dome is being placed over the town you see a clip of the dome settling down crushing a fence. In the next scene you see the dome a good 25 feet in the air awhile a guy is taking his time debating whether or not to stay in the dome or to leave.
- Continuity: When the family first escapes the dome through the sink hole, they have none of their things with them. However, when Marge and the kids are kidnapped by the EPA and being taken back to Springfield in the truck, Lisa has her sax with her.
- Incorrectly regarded as goofs: Hans Moleman is present when Homer dumps the silo in the lake, but nobody finds out it was him until it's discovered. A running gag on the show is that Hans Moleman is shown in situations where he could possibly die, which could be the case here.
- Factual errors: When the Simpsons are in Bart's tree house and it is being pulled down by a school bus, we see Grampa Simpson take aim at them with a shotgun that obviously has two barrels, but he cocks it by pumping it. A double barreled shotgun is cocked by pulling the hammer back.
- Factual errors: Towards the end, Bart and Homer about to be shot by Russ Cargill, who has a double barreled shotgun, but when he cocks it, we only see one hammer. A double barreled shotgun has two.
- Incorrectly regarded as goofs: When Homer goes to the fair, he uses the last $10 that the family has to win a truck. In the next scene at a gas station, Homer is filling up gas, and Marge is planning to purchase beef jerky. However, just because it's the next scene doesn't mean it happened immediately afterward. They could have won some other contest, or tricked someone, or there could have even been some cash in the truck.
- Continuity: When Lisa is standing outside the dome she turns and punches Bart in the face knocking him to the ground. Seconds later Bart is standing up with no sign of him getting up.
- Continuity: When Homer gets his hair torn off by Bart near the end, his hair instantly comes back.
>>> WARNING: Here Be Spoilers <<<
Goofs below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- Continuity: SPOILER: Just as Homer reaches the top of the dome, the next shot looks up showing the people climbing up on the rope to the hole. You see the top of the dome and the hole, but Homer is nowhere to be seen.
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