- Seven studios rejected the original screenplay. Peter Stone turned it into a novel which was serialized in Redbook, and it was then turned back into a screenplay -- which had interest from all 7 studios.
- In the scene where Audrey Hepburn is smoking a cigarette alone in her empty apartment and Cary Grant enters, the backs of his ears had to be covered with masking tape since the backlighting made them appear red.
- According to Audrey Hepburn, the scene where Regina spills ice cream on Adam's suit is based on a real-life accident where Hepburn spilled red wine over Cary Grant's suit at a dinner party.
- Grant was uncomfortable playing a romantic lead with an actress young enough to be his daughter. He was appeased when jokes about the age difference were added to the script and it was made clear that it was Regina who was pursuing him, not vice versa.
- Cary Grant's character quotes a line from My Fair Lady ("On the street where you live"), the film version of which would star Audrey Hepburn the following year.
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