- Ingrid Bergman's first Technicolor film.
- This movie saved Casablanca's famous love theme, "As Time Goes By." Ingrid Bergman began filming For Whom the Bell Tolls immediately after completing Casablanca. For the role, she cut her hair short. Meanwhile, Warner Brothers wanted to substitute another song for "As Time Goes By" and re-shoot some scenes with Bergman. But since she had cut her hair, the inserts would no longer match (even with a wig), so the idea was dropped.
- Ernest Hemingway had Ingrid Bergman in mind as "Maria" while he was writing the novel "For Whom the Bell Tolls".
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