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.

What's Eating Gilbert Grape (1993)
Ending / spoiler
Directed by: Lasse Hallström
Starring: Johnny Depp, Juliette Lewis, Leonardo DiCaprio, 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
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.