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.

What's Eating Gilbert Grape (1993)
Ending / spoiler
Directed by: Lasse Hallström
Starring: Johnny Depp, Leonardo DiCaprio, Juliette Lewis, Mary Steenburgen
Gilbert's mother, who is morbidly obese, makes a change in her life by actually leaving the couch, in this act she dies. She never wanted to be a joke, and if they were to remove her from the house it would have had to been by a crane, so the children decided to spare their mother that embarrassment and burned the decrepit house down. Amy and Ellen moved to a different town with more opportunities, and Arnie and Gilbert went to tour the US with Becky and her grandmother.
Rohan Weerawardane
Arnie Grape: I killed him Gilbert, I killed him.
Trivia: Johnny Depp was unhappy about the fact that he spoke negatively about Darlene Cates (Mama) while he was in character as Gilbert; he would frequently and sincerely apologize to her between takes.
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Answer: They shot it last and they didn't wear wigs.