Roman Holiday

When Gregory Peck came to Italy to shoot the movie, he was privately depressed about his recent separation and imminent divorce from his first wife, Greta Kukkonen. However, during the shoot he met and fell in love with a French-born woman named Veronique Passani, of Italian and Russian parents. Following his divorce, he married her, she became Veronique Peck, and they remained together for the rest of his life.

After Joe throws his drink on Irving, a visible wet mark appears on Irving's shirt. In the next shot, the wetness appears to have disappeared (this occurs twice during the scene).

The writing credits on the film originally completely omitted the name of Dalton Trumbo, who was blacklisted at the time, and read: Screenplay by Ian McLellan Hunter and John Dighton Story by Ian McLellan Hunter In 1991, the WGA acknowledged Dalton Trumbo's authorship of the story, granting him a posthumous "Story By" credit. The "Screenplay By" credit however was not changed. In 2011, Tim Hunter (son of Ian McLellan Hunter) wrote a letter to John Wells, president of the WGA, asking on behalf of Christopher Trumbo (Dalton Trumbo's son), who had just passed, to petition for Trumbo to be recognized as author of the screenplay as well. The WGA further revised the credits, which have been corrected on all copies of the film released since then.

Featured in The Love Goddesses (1965)