Ascended Fan: Of a sort — Peter Falk had said that he had long been a fan of Eddie "Rochester" Anderson, and was overjoyed to work alongside him in this film.
Everybody Owns A Ford: Chrysler sponsored the film to showcase its 1963 lineup. Almost all the heroes drive Chryslers. One of Ethel Merman's lines was written with a Cadillac in mind ("We're the ones in the Imperial and we're running last?"), but was changed because Chrysler sponsored the film and not GM. It has a much more snobbish airs with a Cadillac.
Although, in an odd inversion of Retroactive Recognition, some of the cameos are by relatively minor character actors and TV personalities who might have been readily identifiable to 1963 audiences, but are all but forgotten today.
Judy Garland, who'd teamed with Mickey Rooney in numerous musical comedies in the 1930s and '40s, was originally supposed to play his character's partner. When she proved unavailable, her part was rewritten for a male and given to Buddy Hackett.
Stanley Kramer tried to get Stan Laurel to appear in a cameo, but he declined, having vowed to never appear on stage or screen again after his partner Oliver Hardy died a few years earlier.
Ernie Kovacs was supposed to star with his real-life wife Edie Adams, but he died in an auto accident before production began. Contrary to popular belief, he wasn't intended to play Melville Crump, the onscreen husband of Adams' character.