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The opening title card reads: "Robert Louis Stevenson's The Strange Door." The film's working title was The Door. Hollywood Reporter production charts indicate that Nathan Juran worked as art director for the first week of filming, after which Eric Orbom took over his position. The extent of Juran's contribution to the final film has not been determined. Universal borrowed actress Sally Forrest from M-G-M for this film. British star Richard Stapley's contract was shared between Universal and independent producer Hal Wallis. Stevenson's story had previously been adapted for an NBC television production entitled The Sire de Maletroit's Door, which aired on January 28, 1949 and starred Dan O'Herlihy.