Gregory Peck and director William Wyler clashed repeatedly during filming. After Peck stormed off the set one day following a blazing row Wyler told the press, "I wouldn't direct Peck again for a million dollars and you can quote me on that.".
Charlton Heston initially turned down the role of ranch foreman Steve Leech because he didn't think the part was big enough. His agent convinced him that it would be worth it just for the opportunity to work with Gregory Peck and William Wyler.