- Richard Todd (Major Howard of the British 6th Airborne) was himself in Normandy on D-Day, and participated as Lt. Todd of the British 6th Airborne in the glider assault on the Orne River Bridge.
- As a 22-year-old private, Joseph Lowe landed on Omaha Beach on D-Day with the Fifth Ranger Battalion and scaled the cliffs at Pointe Du Hoc. He scaled those hundred-foot cliffs all over again, for the cameras, some 17 years later.
- Darryl F. Zanuck was quoted in an interview as saying that he didn't think much of actors forming their own production companies, citing 'Wayne, John' 's Alamo, The (1960) project as a failure of such ventures. Wayne found out about this interview before being approached by Zanuck, and refused to accept to be in this movie unless he was paid $250,000 for his role (when the other famous actors were being paid $25,000 for the same movie). Wayne got his requested salary.
- Henry Grace was not an actor when being cast as Dwight D. Eisenhower, but his remarkable resemblance to Eisenhower got him the role.
- Sean Connery, who made his debut as James Bond also in 1962, acted in the movie along with Gert Frobe and 'Curt Jurgens' - two future Bond villains.
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