Audrey Hepburn's salary of $350,000 for the film was the highest salary an actress had ever received to date. When notified of her record salary Hepburn modestly told her agent, "I'm not worth it. It's impossible. Please don't tell anyone."
For the filming of the epic battle scenes, the producers hired 65 physicians, dressed them as soldiers and scattered them throughout the location to take care of any extras or stuntmen who might get injured during filming of the scenes.
King Vidor said, years later, that he would have preferred Peter Ustinov to have played Pierre, with Paul Scofield as his second choice. On the other hand, he had never considered anyone but Audrey Hepburn for the role of Natasha.
Italian director Mario Soldati directed about one-third of the picture including the Battle of Borodino, the entry of the Grand Army into Moscow, their retreat, the Beresina Crossing, and scenes in Bolkonsky's country house. He appears only in the credits as a Second Unit Director.