The three trick-or-treaters who visit the Cunninghams are played by Garry Marshall's two daughters and son.
This episode is very similar to The Andy Griffith Show episode The Haunted House where Opie, also played by Ron Howard, is afraid of an old abandoned house in Mayberry.
Fonzie wears a Lone Ranger mask to Ralph's Halloween party. He would later meet the Lone Ranger in the Season 9 episode, Hi Yo, Fonzie Away (1982).
Linda Purl plays Richie's girlfriend Gloria in this episode. Later on in the series, she plays Fonzie's girlfriend Ashley.
It's never revealed what the "F" on the chest of Potsie's superhero costume stands for.