Continuity mistake: This is when Homer is about to conquer the 'Ball of Death', on his third attempt. As he is going up, just after Lisa shouts, "Don't slow down, speed up," when Homer has his fingers on the brakes, the Ball of Death suddenly gets a lot bigger.
Continuity mistake: The thickness of the dome changes from when it's dropped on Springfield to when they are escaping.
Continuity mistake: The size of the round window in the church changes size throughout the film.
Continuity mistake: During the bike stunt at the end, Homer's hair flows in some shots, but is completely rigid in others. (01:10:00)
Continuity mistake: Marge and Bart discover the wanted poster of them at the gas station. When the clerk enters the scene, his shadow is cast on the wall, cork board and the wanted poster behind him. The clerk never moves, nor does the lighting ever change, but as he says "OK" after Marge asks for diapers, his shadow has vanished.
Continuity mistake: After Marge shouts into the megaphone for the bomb to be thrown, it cuts to Homer and Bart while they're riding sideways on the motorcycle, and the bomb's under Bart's left arm while he's holding onto Homer with his right hand, but in the following shots the bomb's under Bart's right arm while he's holding Homer with his left hand.
Continuity mistake: In the exterior shot of the Simpson house, before showing Homer and Marge watching the news about the silo being found in the lake, we see the side window (facing the Flanders' house, from which they escape later) is a horizontal sliding window. However, from inside the bedroom and also when they are escaping, that same window has changed to a vertical sliding window. The same thing happens with the other window on the opposite side of their chimney.
Continuity mistake: When Homer is riding the motorbike around the ball of death, the first try he has the bike does not have flames painted on but after the third try the flames have appeared on the bike again. (00:41:30)
Continuity mistake: When Homer returns to Springfield, there is full security around the Dome. However, when the bomb explodes there is no sign of any security whatsoever. (01:00:00 - 01:10:25)
Continuity mistake: When Marge and Homer are watching the news about the silo being found, the '6' on Kent Brockman's microphone keeps getting smaller, the color of his belt buckle changes and the landscape in the background changes. (00:32:00)
Continuity mistake: The lead singer of Green Day disappears in the shot from behind the drummer's back - he is nowhere to be seen, even though where he was standing before means he should be visible from that angle. (00:03:20)
Continuity mistake: When Homer tries to convince Bart to come with him on the motorbike, he first holds the bomb in his right hand, but then it's in his left one in a different angle.
Continuity mistake: When the spaceship is landing, there are no craters near, but when Scratchy gets out, there are some craters there. (00:00:31)
Continuity mistake: When Mayor Quimby asks Cletus to demonstrate the anti-pollution barriers around the lake are idiot-proof, his entourage is spread apart, but the next shot of Quimby shows his entourage bunched closer together behind him.
Continuity mistake: When Homer and Bart are trying to outrun the crack in the dome, they are falling towards the damaged "P" in the Springfield sign. From their view, the top of the "P" is level with the letters "S" and "R" but when they use the bent leg of the "P" as a ramp to relaunch themselves at the dome, the top of the "P" is scrunched down almost halfway down from the other letters.
Continuity mistake: When the dome is lowered it is done so by 100s of helicopters that release the dome as Homer runs outside. The camera zooms out to show the whole dome and the helicopters have disappeared instantly. (00:26:20)
Continuity mistake: While Marge and Homer are watching the news on TV note their bed's footboard, then when Lisa angrily rushes into her parents' bedroom to confront Homer, the footboard's style is entirely different, but when Marge pulls Lisa away from Homer the footboard changes back to the original style.
Continuity mistake: When naked Bart skateboards past Wiggum's squad car, the vehicle does not have a partition screen between the front and back seats, a rear-view mirror, or a side mount searchlight, but in the following shots all have suddenly appeared, with other changes.
Continuity mistake: During the church scene, Martha Quimby is wearing an outfit with sleeves, but soon she's sleeveless, then back to sleeves, and finally sleeveless again. Behind Martha sits Bernice Hibbert, whose pearls also disappear and reappear.
Continuity mistake: Throughout the movie, the exterior side wall of the Simpsons garage changes length significantly, even between shots.
Answer: The family doesn't treat him very well, particularly Homer. He may have wanted some revenge on them. Grampa is also a little senile.
Phaneron ★