Jackie Gleason released a version of the title music as a single on Capitol in early 1964, with another Henry Mancini composition, Bird Brain, as the b-side. This puts Soldier in the Rain in the same category as Thunder Road and Because They're Young: movies which had a version of the theme song performed by a member of the cast and released as a single, while that version wasn't the one used in the movie.
In the beginning Eustis Clay is seen admiring a parked sports car. It is a 1962 or early 1963 Shelby AC Cobra, one of the first cars Caroll Shelby made, and extremely valuable.