I understand that it is also based upon a true story.
In addition, it also featured Eliza Dushku (Buffy, Tru Calling), Casey Affleck (brother of Ben), and James Belushi.
It wasn't memorable, but it was cute and not a total waste of time. Also, it was written by Barry Morrow, a member of the Association of Retarded Citizens, the National Association of Social Workers, and the Austism Society of America - a lifelong advocate for the rights of persons with disabilities. That puts him solidly in my camp as I am also a member of NASW and work with the developmentally disabled. Morrow won an Oscar for writing Rain Man.