Erika Eleniak appears as the 'pretty young girl'. She later appeared in Playboy, Baywatch and Under Siege.
Peter Coyote's seemingly sinister government agent was given no name in the film. Instead, he was called 'Keys' after the keys that jingled from his belt. Look out for them when he first appears.
Harrison Ford was originally in the film. He played the school principal at Elliot's school. His scenes were cut because director Steven Spielberg thought they were 'too distracting'.