- Actor-Shared Background: Clint Eastwood is also a veteran of the Korean War.
- Awesome, Dear Boy: Clint Eastwood did this picture because he wanted to make a road movie.
- Breakthrough Hit: For Michael Cimino as a director.
- Dueling-Stars Movie
- Invisible Advertising: The film did respectable box office business, and the studio profited, but Clint Eastwood vowed never to work with the movie's distributor United Artists again due to what he felt was bad promotion.
- Real-Life Relative: Clint Eastwood's son Kyle is in the film. Because he said one word of dialogue, which was "Hi!", this action classified him, in terms of the actor's guild rules, as being in the dialogue category, and as such, had to be paid scale, which was at the time, US $128.
- Wag the Director: Clint Eastwood didn't like to do more than three takes for a shot. Jeff Bridges said, "I would always go to Mike and say 'I think I can do one more. I got an idea.' And Mike would say 'I gotta ask Clint.' Clint would say, 'Give the kid a shot.'" Moreover, First assistant director Charles Okun added, "Clint was the only guy that ever said 'No'. Michael said 'OK, let's go for another take. 'If it was take four, Clint would say 'No we got enough. We got it.'...And if [Cimino] took too long to get it ready, [Eastwood] would say, 'It's good, let's go.'"
Trivia / Thunderbolt and Lightfoot