- Lagene Ethridge was murdered during filming by her boyfriend.
- Lieutenant Finn's fall from his horse was unscripted and unintentional.
- The huge Alamo set took two years to construct.
- 'John Wayne' originally intended that Richard Widmark should play Davy Crockett, while Wayne himself would have taken the small role of Sam Houston so he could focus his energy on directing the picture. But he was only able to get financial backing if he played one of the main parts, so he decided to play Crockett and cast Widmark as Jim Bowie.
- Before those changes, Sonny Tufts was considered for the role of Jim Bowie, and Clark Gable for the role of William Travis.
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