This movie features two actors who played Howard Cunningham. Harold Gould played Howard in Love and the Happy Days/Love and the Newscasters (1972), the unsold pilot featured in Love, American Style (1969). Tom Bosley played Mr. Cunningham in the regular Happy Days - Les jours heureux (1974) run.
Dick Van Patten was known as a nice guy off-screen and on-screen, but he was also a serious, hardcore gambler who introduced his sons to gambling while in their teens. Vincent Van Patten is a serious poker player, and has played in and provided commentary on television poker tournaments.
This is the only one of their six films together where actor's Don Knotts and Tim Conway do not share any scenes.
The chase scene playing on the drive-in screen is from Disney's then recent picture La cane aux oeufs d'or (1971) which was also directed by this film's director Vincent McEveety and had been made and first released about five years earlier. Both movies are comedy-fantasies featuring animals with special abilities.
Richard Kiel: a Tall Man who arises from a dark blue 1962 Volkswagen Sun-Roof Sedan 'Beetle' Type 1.