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Working titles for this film were Cynthia's Secret and The Personal Touch. Hollywood Reporter production charts list Edward Arnold in the cast, but he did not appear in the final film. Dark Delusion was the last in M-G-M's "Dr. Gillespie" series. For more information on the series, consult the Series Index and see the entry above for Calling Dr. Gillespie and Young Dr. Kildare in AFI Catalog of Feature Films, 1931-40; F3.5251.