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Although the film's opening credits read "Jack London's North to the Klondike" and state that the picture was suggested by London's short story "Gold Hunters of the North," no publication information on the story has been found. It is probable that the filmmakers only used London's name. The working title of this film was North of the Klondike. The opening credits read "Jack London's North to the Klondike." No information a Actor Lon Chaney, Jr. is listed without the "Jr." in the opening credits, although it is included in the end credits. Actor Stanley Andrews' character is listed in the film's credits as "Jim Allen," though he is clearly called "Tom Allen" in the film. According to a Universal memo to the AMPAS, the "based on a story by" credit for writer William Castle was agreed upon by a Writers Guild of America arbitraition ruling. Universal press materials state that the film was shot on location in Big Bear, CA for one week.
According to Daily Variety, the film was originally planned as a "low-budget picture shot in 12 days," but Universal executives were so impressed by the fight sequence between actors Broderick Crawford and Lon Chaney, Jr. that they ordered "new scenes and fresh material" to upgrade the picture. Universal publicity materials also state that while actors Willie Fung and Keye Luke played father and son in this film, Fung spoke Cantonese and Luke spoke Manchu Chinese; therefore, in their scenes together, when they are speaking "Chinese," they are actually speaking in two, completely different languages. Modern sources include Spade Cooley in the cast.