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The working title of this film, which was the fifth production in the Hildegarde Withers-Oscar Piper series and the first to star ZaSu Pitts as "Hildegarde," was The Riddle of the Dangling Pearl. Helen Broderick and Edna May Oliver each had played the role of Hildegarde before Pitts. According to modern sources, Hildegarde's character and mannerisms were changed by the writers to accommodate Pitts's "fluttery" acting style. Motion Picture Herald's "In the Cutting Room" includes Spencer Charters, George Sorel, Bodil Rosing and John Miltern as cast members, but their participation in the final film has not been confirmed. For more information on the series, see entry above for Penguin Pool Murder and consult the Series Index.