- Deborah Kerr's singing was dubbed by Marni Nixon, who also dubbed her in The King and I (1956) the previous year.
- Deborah Kerr and Cary Grant improvised many of their scenes throughout filming, and a number of lines that made it to the final cut of the film came from the actors' improvisation.
- References to this movie in Nora Ephron's Sleepless in Seattle (1993), revitalized interest in the film, and led to 2 million additional sales of the 1957 classic on VHS.
- Ingrid Bergman was the first choice to play Terry McKay.
- Nickie and Terry make their conditional promise to meet in six months at exactly the halfway point of the film (59-1/2 minutes into the 119-minute movie).
- Deborah Kerr plays Terry McKay, previously played by Irene Dunne in Love Affair (1939), of which this film is a remake - both were directed by Leo McCarey. The year before this film was made, Kerr played Anna Leonowens in The King and I (1956), also a role that had previously been played by Irene Dunne in the black-and-white classic Anna and the King of Siam (1946). "The King and I" is a musical based on the same book.
- A Bollywood film with the title Mann (1999) starring Aamir Khan and Manisha Koirala was inspired by this movie.
- After the confrontation with the photographer on the ship's deck, Deborah Kerr turns to Cary Grant and says, "So, I go my way [traces a straight path by her hand] and you go yours [traces a twisty path with the waive of her hand]." The same exchange takes place between Irene Dunne and Cary Grant in The Awful Truth (1937), where she says: "As we go down the life's highway, you go in your way [traces a twisty path with the waive of her hand] and I go in my way [traces a straight path]."
>>> WARNING: Here Be Spoilers <<<
Trivia items below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- SPOILER: Was voted the #5 greatest romance of all time by the American Film Institute. This is the highest voted film in which the two lovers end up together in the end.
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