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In the onscreen credits, the film's title is written in both English and Chinese. Voice-over narration, spoken by Ronald Reagan as his character, "Jeff Williams," is heard intermittently throughout the picture. According to an October 1949 ParNews item, Paramount purchased a story entitled "Hong Kong" from David Lang and hired him to develop a screen treatment. Lang's contribution to the final film, if any, has not been determined. Hollywood Reporter production charts list Olivia Louis in the cast, but her appearance in the final film has not been confirmed. Mary Somerville, who plays "Mrs. Lighton" in the picture, is listed in production charts and the New York Times review as Lady May Lawford. Lady May Lawford was actor Peter Lawford's mother.
According to studio publicity, the Chinese-born Danny Chang, who plays "Wei Lin" in the film, was selected for the role after Paramount placed casting announcements in various West Coast Chinese-language publications. Studio publicity also claims that Paramount borrowed the $250,000 statuette used in the film from a wealthy San Francisco merchant. As noted in publicity and reviews, some exterior footage was shot on location in Hong Kong. According to an undated advertisement, contained in the file on the film at the AMPAS Library, Hong Kong was retitled Bombs Over China.