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The working title of this film was The Big Angle. The title then was changed from The Big Angle to Riffraff to Mr. Fix, then back to Riffraff, then to The Amazing Mr. Hammer and back again to Riffraff. With this film, Ted Tetzlaff, who was a well-known cinematographer, returned to feature directing after a six-year absence. Tetzlaff and a camera crew took background shots for the picture in Panama, according to Hollywood Reporter. Hollywood Reporter announced that eighteen-year-old Marilyn Budgeon, who worked as a messenger at RKO, was to play a messenger in this picture under the name Marilyn Messenger, but her appearance in the final film has not been confirmed. Variety gives the film's running time as 70 minutes, but this is probably an error. According to modern sources, Pat O'Brien liked Martin Rackin's script so much that he arranged for Rackin to be hired as a staff writer at RKO. Rackin went on to write three more scripts at RKO for O'Brien-Fighting Father Dunne and Race Street in 1948, and A Dangerous Profession in 1949 ( entries).