Factual error: Approximately 2 hours and 10 minutes into the "restored" full-length video version, there's a birthday party for little Lisa Dickinson, and the Alamo defenders sing "Happy Birthday" to her. The Alamo battle happened in 1836. According to David Ewen's "All the Years of American Popular Music," the song "Happy Birthday to You" was composed and copyrighted by sisters Patty and Mildred J. Hill, first as "Good Morning to All," in 1893.
Trivia: In 2010, on the 50th anniversary of the release of the film a reunion was held at The Alamo Village. Of the main actors only 6 of them were still alive. 69 year old Frankie Avalon was there and five defectors were there with Mrs John Wayne. Richard Widmark (Jim Bowie) had died in 2008.