Daniel Stern, who plays Glen Stevenson (the father of Fred Savage's Brian Stevenson), was the man responsible for the voice-over narration on The Wonder Years (1988), in which Savage starred.
In the scene where Daniel Stern is asking Fred Savage to get the monster's autograph, the tickling was improvised and Savage's reactions are genuine.
Because of a fire that destroyed costumes and props, filming was pushed back two weeks.
This is the first role for Fred's younger brother, Ben Savage.
Kala Savage (sister to Fred and Ben) has a small role as a little monster.