Executive Meddling: On a governmental level. The film company was forbidden to actually pay the Zulu's acting as extras, under apartheid laws. Director Cy Enfield, who'd struck up a friendship with the Zulus acting in the film, was upset with this and decided to leave them the cattle used in the film, more valuable to them than money.
Playing Against Type: Inverted. Michael Caine, who would go on to play working class Cockney characters throughout his career, plays a snobby aristocratic officer with a posh accent in this movie — his first.