Continuity mistake: In the scene were Gilbert and his friends are in the diner and Gilbert is pouring the salt out onto the table look at how much salt is in the bottle just before the shot switches to Gilberts friends and the look at how much salt in the bottle when the shot switches back. In the first shot there is less salt than in the second shot.
Continuity mistake: In the sunset scene, Becky comments on how Gilbert missed the sunset. Then later, stock footage is used to show his house, and we see that the sunset is still going on. Not only that, but Gilbert's house consists of a single building, while this shot shows more than one building.
Continuity mistake: In the scene after the funeral, you see that Juliette Lewis gets groceries and gets a ride from Johnny Depp. They put the groceries in the back of his truck on the right side under a tarp because it's raining. When they get to her camper, the groceries are now on the left side of the truck.