Charles Bronson refused to play in the scene where he saves a naked woman. He refused because she was without clothes. Director Michael Winner eventually used a trick to make the scene without Bronson's agreement.
Jack Palance insisted that one of the scenes use a master shot, and so they did a master shot and he was furious because then he had an idea and they couldn't do anything about it. Director Michael Winner said "Jack - serves you right. You and your bloody master shot!"