Does Arnie Grape have autism? Arnie Grape is a fictional character from the movie and book titled What’s Eating Gilbert Grape? Arnie is a developmentally disabled teen played expertly by actor Leonardo DiCaprio (Titanic), who was nominated for an Oscar for his performance. Arnie’s diagnosis is never specified, but he has many qualities consistent with autism, including self-stimulatory… Continue reading Is Arnie Grape autistic?