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The working title of this film was They're All Crazy. Early Hollywood Reporter news items state that Universal producer Alex Gottlieb was not only set to produce this film, but also was going to write the screenplay based on a treatment by Robert Lees and Fred Rinaldo, which had been approved by Universal and performers Ole Olsen and Chic Johnson. It has not been determined if Gottlieb contributed in any way to the released film. According to Hollywood Reporter, the film's finale was shot with the use of two film crews, one directed by Edward F. Cline, the other directed by associate producer Erle C. Kenton. Hollywood Reporter also reported that actress Cass Daley was borrowed by Universal from Paramount for this film.
Hollywood Reporter production charts include Moroni Olsen and Bobby Brooks in the cast, but their appearance in the released film has not been confirmed. Actors Basil Rathbone and Nigel Bruce appear in this film as the characters "Sherlock Holmes" and "Dr. Watson," whom they had portrayed in numerous Universal pictures. According to modern sources, their scene in this film was filmed on the set of their 1944 film Sherlock Holmes and the Spider Woman .