The first theatrical feature from Hanna-Barbera Productions.
Mugger, the Chizzling Brothers' snickering dog, later became Muttley in the TV series Wacky Races (1968) and Dastardly & Muttley e le macchine volanti (1969).
The first animated theatrical film based on a TV series.
First Hanna-Barbera film distributed by Columbia Pictures instead of UPA, who expired the contract and began releasing TV cartoons from 1959. The film is now owned by Warner Brothers.