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The working title of this film was Ghosts of Rimrock. Actor Ian MacDonald's surname is misspelled "McDonald" in the opening credits. Some scenes were shot on location in Lone Pine, CA. The picture marked the feature film debut of Brad King, and the introduction of his character "Johnny Nelson" to the Hopalong Cassidy series. "Johnny" replaced the character "Lucky Nelson," played by Jimmy Ellison and Russell Hayden. For additional information on the series, consult the Series Index, and see the entry for Hop-Along Cassidy in AFI Catalog of Feature Films, 1931-40; F3.1990.