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The working title of this film was Miss M from Moscow. PRC changed the title at the request of Warner Bros., who believed that the PRC film might be confused with their release Mission to Moscow (see below). Although Noel Madison's character is listed in cast credits as "Capt. Anton Kleis," he is called "Fritz" in the film. Sound engineer P. J. (Percy) Townsend's name was misspelled in the credits as "P. L."