- This film about the California Gold Rush was actually shot in the Cascade Mountains of Oregon.
- Many extras in the film were actually some "hippies" who just happened to be living in the woods near where the crew built the sets.
- The film went notoriously over budget and was a box office failure when originally released. This project reportedly inspired Clint Eastwood to have more control over film budgets and schedules by starting his own production company.
- Jean Seberg had her singing voice dubbed by Rita Gordon while Clint Eastwood and Lee Marvin did their own singing. Although it was a musical, no choreographer was ever hired.
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