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Pre-release titles of the film were City of Lost Men and Years Without Days. An earlier film adaptation of Lewis E. Lawes' novel was made by Warner Bros. in 1932 under the title 20,000 Years in Sing Sing (see below). According to modern sources, extensive footage from 20,000 Years in Sing Sing was used in this film. Sets were designed to match the originals so that medium as well as long shots could be used.