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 and Muttley in Their Flying Machines (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.