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The working title of this film was Tarzan in Exile. It was also reviewed as Tarzan Finds A Son! According to news items in Hollywood Reporter, the underwater scenes were shot at Crystal Springs and Silver Springs, Florida, and additional location shots were filmed at Ocala, Florida. Other items in Hollywood Reporter note that the elephants featured in the stampede scene were provided by the Hagenbeck-Wallace Circus and the film's shooting schedule was modified to allow star Maureen O'Sullivan, who was pregnant at the time, to finish shooting before her condition prevented her from doing so. The studio originally wanted to replace O'Sullivan because of her pregnancy, but exhibitors insisted that she reprise her role as "Jane." Also, according to studio records, in the original screenplay for the film, "Jane" is hit in the back by a spear while rescuing "Boy", and she dies soon after Tarzan finds her. In a letter to an M-G-M official dated January 6, 1939, Edgar Rice Burroughs stated that he regretted the killing of Jane in the screenplay and feared that the ending would have a bad result at the box-office. An "alternate ending," which corresponds to the ending used in the final film, is included in a screenplay dated January 31, 1939. Modern sources state that the first ending was shot and previewed, and that audiences disapproved of "Jane's" death. For additional information on M-G-M's "Tarzan" series, consult the Series Index and see the entry below for Tarzan, the Ape Man.