Paul Robeson's chest hair comes and goes, from one sequence to another.
Although the film is nominally set in Nigeria (as shown on the map in Sanders' office), the aerial wildlife shots seem to have been taken in East Africa (e.g. Kenya, Uganda, Tanganyika). Given the presence of Jomo Kenyatta as an extra in the cast, it is likely that the African scenes were shot on the eastern coast of Africa rather than in Nigeria.