Cole Porter's genial, "unsophisticated" cowboy song, "Don't Fence Me In," via the Decca recording by Bing Crosby (who did not appear in the picture) and The Andrews Sisters, reigned as the number-one "Billboard" single for eight weeks, between December 23, 1944 and February 10, 1945.
Joan Crawford, so the myth goes, found out that Bette Davis and Barbara Stanwyck were slated to be in the film as well; she reportedly asked about the billing. After being told it was alphabetical, she realized that "C" came before "D" or "S", and agreed to do the film.
Originally conceived by Warner Bros. as a multi-studio (like the actual Hollywood Canteen) WWII effort with rival studios (Fox, Paramount, MGM, etc.) contributing cameo appearances by its stars. But when other studios balked at having performers appear (even though profits were reportedly earmarked for war effort), Warner turned it into a single-studio affair.