- When filming the scene where the princess (Audrey Hepburn) says her goodbyes to Joe, the inexperienced Hepburn was unable to produce the necessary tears, eventually causing director William Wyler to complain at the number of wasted takes. Hepburn promptly burst into tears and the scene was filmed successfully.
- The joke where Joe (Gregory Peck) pretends that his hand was bitten off in the mouth of the stone carving was adlibbed by Peck, and thus Hepburn's reaction is genuine.
- After filming, Peck informed the producers that, as Hepburn was certainly going to win an Oscar (for this, her first major role), they had better put her name above the title. They did and she did.
- This was originally a project for Frank Capra, who had planned to cast Cary Grant and 'Taylor, Elizabeth' in the parts played by Gregory Peck and Audrey Hepburn.
- William Wyler at first wanted 'Simmons, Jean' to play Ann, and reportedly nearly canceled the project when Simmons proved unavailable.
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