John Milius — who was hired to punch up the Evel Knievel screenplay in 1970 — remembered the real-life daredevil as someone whose off-screen persona bled violently into his private life. Milius told a vivid anecdote that while reading the script to Knievel he realized the man was 'kind of a sociopath' and 'totally messed.' According to Milius, Knievel famously adopted bits of the movie's dialogue for himself and, in a darker episode the writer recounted, 'went and took that baseball bat and broke that guy's arm and that finished his career in the toy business.' The remark became shorthand among those on the production for Knievel's volatility — jealous, quick to turn on collaborators, and determined to control how he was portrayed; he even later made a film of his own. While Milius' telling is sourced to contemporaneous interviews around the film's production, it left a lasting scar on Knievel's public image: rather than merely a showman courting danger, he was portrayed by insiders as someone whose bravado could turn into real-world aggression, a detail that complicated the star turn George Hamilton was asked to embody on-screen.
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