- California Doubling: Subverted; Warner Brothers actually asked Eastwood to film in Toronto, but he refused and insisted on shooting it entirely in its set location of Boston, which they conceded to.
- Shrug of God: The final interaction between Sean and Jimmy at the parade was intentionally ambiguous, with Clint Eastwood explicitly saying that it's up to the audience to decide what was going on between the characters. Whenever Kevin Bacon is presented with a fan theory, he'll merely say that it's a good observation.
- Those Two Actors: Sean Penn and Kevin Chapman also appeared together in 21 Grams.
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