- Divorced Installment: William Wyler first considered making this film as a follow up to Roman Holiday; as in that film, Gregory Peck would have played the male lead opposite Audrey Hepburn. At that time he had a darker mood in mind and approached Stanley Kubrick, who had recently made The Killing, to contribute.
- Fake Nationality: Audrey Hepburn, born to British and Dutch parents, plays the French Nicole, and the Welsh Hugh Griffith plays her father.
- Role-Ending Misdemeanor: During production, Hugh Griffith was fired for persistent bad behaviour, including walking around naked through the corridors of the George V Hotel holding a 'Do no disturb' sign over his privates, which he'd altered to read 'Do disturb'.
- Romance on the Set: Averted. There were rumours that Peter O'Toole and Audrey Hepburn were having an affair. In reality, they were just good friends.
- What Could Have Been: Walter Matthau was the first choice for Davis Leland but was looking for $200,000 so they went with the less expensive George C. Scott. Scott had been on the set a few weeks before shooting began. However on his first day of shooting, he didn't turn up until after lunch, and William Wyler took the decision to fire him.
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