When Eisenhower is in his quarters and is awake early in the morning and the alarm clock rings, the clock is located at the foot of the bed. When Eisenhower sits back on the bed the clock has moved to near the pillow at the head.
During his discussion with Churchill at the beginning of the film, Ike refers to General "Jimmy Spaatz." General Spaatz's first name was Carl and his nickname was "Tooey." The writers were perhaps confusing him with General "Jimmy" Doolittle.
When Ike briefs Charles de Gaulle on 4 June 1944, de Gaulle is shown objecting to different parts of the battle plan. In fact he had no such objections, and complimented the "Anglo-Saxons" on their attention to detail.
When De Gaulle arrives for the meeting with Eisenhower, the Free France flags on the cars wings are shown flying with the red on the pole side. French flags, including Free France's, are always flown with the blue on the pole side.
In the restaurant scene, when Gen. Miller starts talking about the incoming invasion -which, in turn, will lead to his discharge by Eisenhower-, the colonel sitting with him at the table has the artillery badge (the crossed cannons on his jacket's lapels) upside down.
Ike is shown visiting the paratroopers on D-Day, June 6, 1944. This actually occurred the day before, on June 5th. Most of the planes were in the air by the night of June 5th, on their way to France. (likely an editorial mistake)
At the end of the movie, when Ike is walking away from Gen Smith with the news and the apology, the camera is moving from left to right following Ike, there is an officer who looks at the camera when pointing at him and then he looks down..
Incorrectly regarded as goof. Charles de Gaulle complains to Dwight D. Eisenhower that "You urge Frenchmen to follow your orders" even though French naval and ground forces were already under Eisenhower's command and participating in D-Day. However, de Gaulle is referring to Eisenhower's BBC speech to the all the occupied nations of Western Europe, in which Eisenhower tells French civilians to follow his orders. In that D-Day broadcast, Eisenhower addressed the French:
Citizens of France! I am proud to have again under my command the gallant Forces of France. Fighting beside their Allies, they will play a worthy part in the liberation of their Homeland. Because the initial landing has been made on the soil of your country, I repeat to you with even greater emphasis my message to the peoples of other occupied countries in Western Europe. Follow the instructions of your leaders. A premature uprising of all Frenchmen may prevent you from being of maximum help to your country in the critical hour. Be patient. Prepare! As Supreme Commander of the Allied Expeditionary Force, there is imposed on me the duty and responsibility of taking all measures necessary to the prosecution of the war. Prompt and willing obedience to the orders that I shall issue is essential.
Citizens of France! I am proud to have again under my command the gallant Forces of France. Fighting beside their Allies, they will play a worthy part in the liberation of their Homeland. Because the initial landing has been made on the soil of your country, I repeat to you with even greater emphasis my message to the peoples of other occupied countries in Western Europe. Follow the instructions of your leaders. A premature uprising of all Frenchmen may prevent you from being of maximum help to your country in the critical hour. Be patient. Prepare! As Supreme Commander of the Allied Expeditionary Force, there is imposed on me the duty and responsibility of taking all measures necessary to the prosecution of the war. Prompt and willing obedience to the orders that I shall issue is essential.
In the scene where Eisenhower is holding the clip-board you can clearly see a laser scan bar code on the back.
The person forecasting the weather mentioned "the jet stream" as the cause for the rapid moving weather pattern. The jet stream wasn't fully understood until the fall of 1944 and wasn't named until even later.
The sound effect of the old typewriter on screen was the sound of an IBM Selectric Typewriter--the typewriter with a ball with the letters on it--a unique sound very different from an old, manual typewriter.
Laurence Olivier's film of Henry V (1944)is screened within this film in the spring of 1944, despite the fact that Olivier's film was not completed by that time and was not released in the UK until six months after the period depicted in this film.
At 6'4", Tom Selleck towers over most of the other characters. Eisenhower was only 5'10" and was shorter by 4 inches than George Patton, at 6'2".
Group Captain James Stagg, the chief weather forecaster for D-Day, was born in 1900, so 44 at the time of the action yet is played by someone obviously much younger, who is treated as such by the senior staff.
When Patton is getting back in his vehicle after talking with Eisenhower the 2 US MP's are saluting 2 British officers entering the building. The one on the left is saluting US style palm down, the one on the right is saluting British style palm out.
When Patton reports to Eisenhower, he is wearing his helmet. No officer would wear his helmet indoors, especially when reporting to their superior.