The Hays office, the official Hollywood censor, banned the stage play "Kongo" from the screen, so to bypass the ruling, MGM changed the title first to SOUTH OF THE EQUATOR, then finally to WEST OF ZANZIBAR. Owen Moore was originally set to play Doc, but the role went to Warner Baxter instead. Mary Nolan was hired to play Maizie because she had "such sad eyes". Cedric Gibbons and Richard Day designed the sets, and David Cox handled the costumes.[2]
West of Zanzibar is intriguing to Lon Chaney fans because of the lost or excised sequences that Browning allegedly shot for the film that no longer exist; in particular, Phroso (Chaney) in costume as The Human Duck in a freak show act and scenes showing Phroso and his troupe when they first arrive in Africa. Stills of Chaney in the duck costume exist, but it is unclear whether the scene was actually shot, or merely planned and publicity stills were taken.