* Engineers are seen removing explosives from the Orne Bridge. In reality they hadn't been placed in their slots when the gliders landed. Zanuck chose to ignore Howard's telling him this for the sake of drama.
* However, a scene where German soldiers are seen running out of the cafe near that bridge wasn't done, as one of the owners insisted vehemently she had never allowed Germans to sleep there.

* AllStarCast: If you were an A-List male actor in Hollywood in 1962, you have at least a bit part in this film. Plus a couple well-known British, French and German actors.
* AsHimself:
** Almost. Actor Richard Todd plays John Howard, the Major whose unit secures Pegasus Bridge. One of the relief units coming to their aid was led by Captain Richard Todd!
** Played straight with Joseph Lowe, one of the cliff climbers at Utah Beach who reprised his efforts for the movie.
** Also played straight by Bill Millin, the bagpiper with Lord Lovat's commandos.
* BackedByThePentagon: About 23.000(!) real US, British and French soldiers were used as extras in the movie. They also rented two Messerschmitts from the Spanish air force and four Spitfires from the Belgian air force.
* CastTheExpert: Richard Todd, who plays Major Howard of the British Airborne, was a British paratrooper during the war and actually took part in the D-Day landings -- in fact, he was initially approached to play ''himself'' in the film.
* DawsonCasting: John Wayne as Lieutenant Colonel Benjamin Vandervoort. The real Benjamin Vandervoort was 12 years younger than Wayne when the movie was made. He was actually just 27 during D-Day, when Wayne was '''54''' when the movie was filmed.
* HeyItsThatGuy:
** Besides the ones mentioned below, there's Red Buttons, John Wayne, Robert Mitchum, Eddie Albert, Paul Anka, Fabian, Robert Wagner, Richard Dawson...
** Also cartoonist and comedian Creator/{{Loriot}} in an uncredited bit part as a German staff officer.
** Two German actors were future ''Film/JamesBond'' villains:
*** Gert Fröbe -- best known for playing the title role in ''Film/{{Goldfinger}}'' -- as the German sergeant Kaffeekanne, who rides his horse to the beach every morning to bring coffee to the troops.
*** Curd Jürgens (credited here as Curt Jürgens) -- who played Karl Stromberg in ''Film/TheSpyWhoLovedMe'' -- as Major General Gunther Blumentritt.
*** The first Film/JamesBond himself, Sean Connery, is one of the British soldiers landing on Sword beach.
* LifeImitatesArt: The code names given to some of the objectives (Pegasus Bridge, Utah, Omaha, Juno, and Sword Beaches) have been retained to this day.
* RealLifeWritesThePlot:
** Roddy [=McDowall=] asked for a small role to spare his boredom after ''Film/{{Cleopatra}}'' was delayed... AGAIN.
** Creator/SeanConnery, on the other hand, also has a small role because he was eager to get off to Jamaica and begin filming ''Film/DrNo''.
* RetroactiveRecognition: Before he became famous, Creator/{{Loriot}} got cast by Bernhard Wicki in an uncredited bit-part as a junior Wehrmacht staff officer.
* ThrowItIn: While clearing a section of the Normandy beach near Pointe du Hoc, the film crew found a tank used in the invasion. They cleaned it up and used it for the British Invasion scenes.
* WhatCouldHaveBeen:
** Creator/ChristopherLee, who fought in the War as an intelligence officer with the RAF, auditioned for any role he could get. He was turned down because the producers felt [[{{Irony}} he didn't look like a military officer]].
** This was made just after DwightDEisenhower's presidency and the producers very nearly '''cast Eisenhower to play himself'''. They abandoned the idea because he was too old, though.

----