Ray Dennis Steckler tried to make a straight crime drama, but after he shot about 40 minutes of footage, he decided the film was simply not working. He couldn't afford to scrap the footage, and portions of the film were unintentionally funny, so he had two of the characters go into a room, then burst forth in makeshift costumes as Rat Pfink and Boo Boo. He padded out the rest of the film with chase scenes, fight scenes, and even an encounter with a gorilla. He had footage of the duo appearing in a genuine parade, as if it were being held in their honor. When the main title was being animated, the "n" and "d" were left out, so the title appears as "Rat Pfink a Boo Boo."
When the kidnappers open the briefcase containing comics, the most visible magazine is Issue #2 (January 1965) of "Monster World," published by Warren and featuring the cast of The Munsters (1964) on the cover. Monster World was a sister publication of Famous Monsters. While Famous Monsters had a long distinguished career, folding only when Warren went under, Monster World didn't last as long.