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Working titles of the film were Secret Agent J-37, Secret Operator, Appointment in the Pacific and Rendezvous in the Pacific. Hollywood Reporter news items note that Ruth Hussey was originally scheduled to play the female lead, Leonard Smith was to be the film's cameraman and George B. Seitz was set to direct. Another Hollywood Reporter news item noted that actor Felix Basch made his American motion picture debut in the film.
According to a note attached to the SAB in the AMPAS Library file on the film, although Bella and Samuel Spewack were listed by M-G-M as contributing writers to the project, the studio did not list any source material for the film which was "a remake of a previous Metro picture," as it did not want that fact "publicized in any way." The "previous picture" was the 1935 film Rendezvous, directed by William K. Howard and Sam Wood, and starring William Powell and Rosalind Russell. P. J. Wolfson and George Oppenheimer were credited with the screenplay of Rendezvous, and the Spewacks were credited as adaptors of the book The American Black Chamber by Major Herbert O. Yardley (Indianapolis, 1931). The 1935 film was very similar in plot to the 1942 film, although the latter was updated to make it contemporary to World War II (see AFI Catalog of Feature Films, 1931-40; F3.3687).