Factual error: The song that Bo and the others use to trick Abdul into thinking there are reinforcements is "Durch die Grune Heide", a marching song used during the Second World War. However, the film is set in 1906.
Continuity mistake: During the attack on Fort Zuassantneuf, Commandant Burger has a monocle over his right eye. When Burger says "Look out, here they come!" his monocle has disappeared, but a few shots later it has re-appeared.
Trivia: When Commandant Burger yells "Silence!" to Bo West during the parade inspection, West drops the rifle on Burger's foot. Jim Dale accidentally dropped the rifle on Kenneth Williams' foot, his painful reaction was genuine and the injury caused Williams to limp for the remainder of his scenes. Dale swore it was accidental but Williams insisted in his autobiography that it was deliberate.
Simpson: You mean all these ladies are the Sheikh's wives?
Sgt. Nocker: Yes. What's so terrible about that?
Simpson: Think, all those mothers in law.