Five songs were dropped from the release print: "Coming in on a Wing and a Prayer" (music by Jimmy McHugh, lyrics by Harold Adamson), sung with a bit of comedy by Martha Raye; the slightly risqué "SNAFU" (music by McHugh, lyrics by Adamson), sung and danced by Martha Raye, Carole Landis and Mitzi Mayfair; "It's the Old Army Game" (music by McHugh, lyrics by Adamson), performed by Kay Francis (reciting rather than singing while supposedly playing the piano), plus Raye, Landis and Mayfair; "Silent Night" (music by Franz Xaver Gruber, lyrics by 'Josef Mohr'); sung by Martha Raye; and "Mamae Yo Quero" (music by Vicente Paiva, Portuguese lyrics by Jararaca), sung and danced by Carmen Miranda. All five songs as filmed still exist.
Carole Landis wrote a 1942 book about the story in this film, also called "Four Jills in a Jeep".
According to "The Real Four Jills," a documentary short about the film, Kay Francis and Carole Landis became intimate during the USO tour. Landis presented the affair as simply a close friendship, but Francis's diaries are blunt about their sexual nature.
Guest star Betty Grable's appearance was her last in a black-and-white feature film, not counting her showing up later that year in Take It or Leave It (1944), which recycled "The Sheik of Araby" footage with Betty, Alice Faye and Billy Gilbert originally from Tin Pan Alley (1940).
The title "Four Jills In A Jeep", is a play on a 1942 song by The Andrews Sisters titled "Six Jerks In A Jeep"
The Harold Adamson lyrics for the song "Ohio" were discarded. Mitzi Mayfair danced to Jimmy McHugh's melody played by Jimmy Dorsey and His Orchestra. On the Decca recording by Mr. Dorsey, the lyrics were restored for his singer Gladys Tell.
The original title for the movie was Command Performance. 20th Century changed it to Four Jills In A Jeep before its release.
The radio program shown in the film, Command Performance, was transcribed and transmitted to soldiers using shortwave. Since it was only available to soldiers and not broadcast publicly, few people in the US ever heard it (except for the 1942 Christmas special). The program was famous for being a bit more risqué (no network censors), and for taking soldiers' suggestions. One of the more famous suggestions asked for Carole Landis to sigh on the air, which she did.
Each of the major studios conceived a lavish, star-laden entertainment on behalf of the war effort, released to theaters but meant specifically for servicemen. In this spirit, MGM produced Thousands Cheer (1943), Universal made Follow the Boys (1944), Paramount offered Star Spangled Rhythm (1942) and Warner Bros. delivered Thank Your Lucky Stars (1943) and Hollywood Canteen (1943). Fox went a different route with Four Jills in a Jeep (1944), which was modestly produced, only ninety minutes in length, and did not employ more than a handful of guest stars, focusing instead on re-enacting the real-life wartime adventures of its four stars.
Screen debut of big band singer Dick Haymes, who remained at Fox for several years.
With just a few exceptions, the entire score is comprised of songs from earlier Fox musicals.