- "Five Easy Pieces" refers to a book of piano lessons for beginners.
- The song played by Dupea on the piano in the back of the truck driving down the road is Chopin's "Fantaisie" in F.
- When Dupea goes to quit his oil-rigging job, the loud whirring of machines can be heard in the background. This identical sound effect was used seven years later by George Lucas, for the trash compacter scene in Star Wars (1977).
- Carole Eastman's original ending had Bobby being killed in a car crash.
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