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A song, possibly called "Three Outlaws," is sung over the opening credits. Neither the songwriter nor the male singer is identified in contemporary sources, but it is likely that the song was written by Paul Dunlap, who is credited onscreen as the music composer and conductor. Although the cutting continuity for the film spells the name of the character portrayed by Jeanne Carmen as "Zerelda," publicity materials spell it "Serelda." Within the film the name seems to be pronounced "Serelda."
Although the film was fiction, it was inspired by the historical figures Butch Cassidy (Robert LeRoy Parker, 1867-1908?) and The Sundance Kid (Harry Longbaugh, 1861-1908?), who have been the subjects of many films. For information on additional films featuring Butch Cassidy and The Sundance Kid, please consult the entry above for the 1951 Columbia release The Texas Rangers.