Keye Luke reportedly clashed with director Harry Lachman over the latter's treatment of the circus midgets in the movie.
Two actors who played Charlie Chan appear in this film, Warner Oland as Chan and J. Carrol Naish in a supporting role as Tom Holt.
The action occurs mostly at the Kinney & Gaines Combined Circus.
The Carney introduces Tim (George Brasno) and Tiny (Olive Brasno) as "Col. Tim 42" small and "Lady Tiny 2 inches smaller."