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According to Hollywood Reporter news items and production charts, John Carradine and Joyce Compton were to be included in the cast of this film, but their participation in the completed picture is doubtful. A April 19, 1939 Hollywood Reporter news item refers to the film as Charlie Chan at the World's Fair. The Golden Gate International Exposition, held on Treasure Island in San Francisco Bay February 1939-October 1940, provided the backdrop for some of the picture's action. For more information on the series, please consult the Series Index and see the entry below for Charlie Chan Carries On.