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Set designer A. Roland Fields's name was misspelled in the opening credits as "Field." A November 1946 Hollywood Reporter news item announced that producer Seymour Nebenzal won the right to use the title Heaven Only Knows after a dispute with Universal. According to a modern source, however, the film's title was changed to Montana Mike during its initial release. The film's MPAA/PCA file at the AMPAS Library lists the picture under that title, although there is no mention of the title Montana Mike in the file itself. According to a Hollywood Reporter news item, Marjorie Reynolds replaced Helen Walker in the cast. Reynolds was released from her contract at Paramount for this film. Hollywood Reporter news items add William Farnum, Glenn Strange and Jimmy Ames to the cast, but their appearance in the final film has not been confirmed. Hollywood Reporter also announced that radio actor Elliot Lewis was to provide commentary for the film's trailer.
According to Hollywood Reporter, release of the film's prints was held up after child actor Gerald Perreau requested that he be listed as Peter Miles, the screen name director Lewis Milestone gave him for The Red Pony . According to an article in New York Times, the film's original script called for "Mike" to emerge from the gambling house inferno "gallantly carrying corsets, brassiers and other intimate bits of apparel, to receive the vociferous thanks of their lovely owners." A letter from the Breen office, contained in the PCA file, instructed the studio to change the scene, noting that "it will be necessary to delete all scenes of sexual embarrassment on his [Mike's] part." For the final film, "Mike" was to exit the fire carrying the pants of "Duke," which prompted a New York Times production item to comment that the "double standard prevails even among the administrators of the Production Code." The PCA also objected to the script's description of "Mike" as the Archangel Michael because religious viewers might take offense at a comic characterization of the Biblical figure. Instead, the PCA suggested that the filmmakers characterize "angels of [a] lesser degree" and rename the protagonist. Although the angel's name remained "Mike," he was depicted as an angel low in the ranks of heaven.