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On 29 July 1949, Hollywood Reporter reported that Jack Warner was negotiating with Cary Grant to co-star with Betsy Drake in this film. Drake and Grant, who had become romantically involved, eloped shortly after production started on the picture. According to the production notes, Warner Bros. built a complete replica of the New York City Spring St. subway station, including the train, for the film. Dennis Morgan and Drake reprised their roles for a Lux Radio Theatre presentation of the story on November 20, 1950.