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The working title of this film was Mr. Moto at the Ringside. Motion Picture Daily reviewed this film under the title Mr. Moto's Diary. According to news items and information in the Twentieth Century-Fox Records of the Legal Department at the UCLA Theater Arts Library, this film was developed after production on Charlie Chan at the Ringside was halted. The studio began production of the latter film on January 10, 1938 with Warner Oland starring as Chan. Production was halted on January 17, 1938 after $93,820.59 was spent, due to a disagreement between Oland and the studio. At that time, news items speculated about a successor to Oland in the role. On January 24, 1938, production began again as part of the "Mr. Moto" series, with all but two of the original cast: Oland, who was replaced by Lorre as Moto, and Paul Hurst, who was replaced by Harold Huber. According to correspondence from producer Sol Wurtzel, $46,341.10 was salvaged by converting the story to the "Mr. Moto" series. Wurtzel suggested that the bill for the remainder, $39,979.49, should be sent to Oland. No information has been located to determine whether this was done. Oland subsequently died before another "Charlie Chan" film was produced. Chick Chandler was originally scheduled to be in Charlie Chan at the Ringside, and John Carradine was listed in Hollywood Reporter production charts for both films, but neither appeared in the final film. For further information on the "Mr. Moto" series, please see the entry below for Think Fast, Mr. Moto and consult the Series Index.