Continuity mistake: When the two deer enter through the cabin window to help Homer and Marge, a trail of snow is visible behind them and in front of the window. In an instant close-up of the smaller deer, half of the snow has instantly melted and vanished. Then all the water has vanished and it's just snow. Then a few shots later, the snow vanishes completely.
Continuity mistake: When Marge and Bart are at the counter at the gas station, the first shot of them at the counter shows the strap on Marge's bag facing behind the bag. The shot then changes to Bart using his slingshot, and Marge, visible in frame throughout the entire shot, is never shown touching the bag, but when the shot cuts again, the strap is suddenly in front of the bag.
Continuity mistake: When the Simpsons are at the gas station, Marge congratulates Bart on being sober for 24 hours. The Buzz Cola can next to Bart has the logo facing front ways. Bart then aims his slingshot which cuts to a shot from behind them and the Buzz Cola logo on the can is still facing front ways, despite the angle change.
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.
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 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 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.
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 ★