Marcelo, a 7-year-old with low-functioning autism hits his sister and then slaps himself in the face. He is also shown head-butting his mother because he does not want to get his hair cut.
Joey Morales-Ward is a severely autistic 13-year-old boy, who's condition is shown in great detail. Parts of his behaviors include self injurious behavior (SIB) as well as physically attacking his parents and teachers. He is shown punching them as they try intervene in stopping his tantrums (meltdowns).
References to a man's violent behavior associated with low-functioning autism, including an arson he committed as a child are referenced a few times.