- The Academy Award-winning song "The Windmills of Your Mind" from this movie is sung by actor Noel Harrison, son of Rex Harrison.
- Legendary documentary filmmaker Frederick Wiseman reportedly wrote one version, or contributed to screenplay of this film, without any on-screen credit.
- Of all of the films that Steve McQueen made in his career, this is reported to have been his favorite.
- After watching a five hour rough cut of The Thomas Crown Affair, composer Michel Legrand took a six week vacation during which he wrote 90 minutes of music. The film was then reedited to the music, instead of the other way around. If this experiment had failed, Legrand would have written a second score in the traditional way free of charge.
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