The movie "The Switch" with Jason Bateman and Jennifer Anniston seems to portray a man and a little boy with several autistic traits. I really enjoyed the movie and want to watch it again, next time paying closer attention to those characters.
I also recently watched "Autism: The Musical" and heartily recommend it. Heartbreaking and heartwarming at the same time! I empathized so much with the parents of the autistic children.