At 01:06:52 the soldiers webbing shoulder strap is dated 1943 next to the military broad arrow. The Dunkirk Evacuation was in 1940, three years prior.
When the two soldiers are drinking the bottle of wine in the safe house, the level of the wine doesn't change after each of them have drank from the bottle twice. Then when Walker passes it back the last time about a third of the bottle is gone.
At 1 hour there is a clearly visible satellite dish on the small outbuilding.
At 1.03 the German officer tortures the resistance chap with a Philips screwdriver .
Some of the British soldiers are shown wearing the 1942 style US Army helmets.
The SS commander wears a tunic displaying the collar patches and shoulder straps of an SS private, while one of his men is clearly wearing a 'German Army' Officer's tunic together with what looks like some form of SS forage cap.
Several of the soldiers are depicted as Paratroopers. The Parachute force was only conceived shortly after Dunkirk on 22th June 1940. No 2 commando being assigned to Parachute duties and designated 11th Special Air Service Battalion in November 1940. In February 1941 They were renamed 1st Parachute Battalion, when the 1st Parachute Brigade was formed.
At around 58 mins when the Nazi Commander asks: "Have Stryker and Mueller returned?", he points to a map and says "They were checking houses in this area". There are no houses (or any other discernible structures) on the map in the area that he points to. This is because he points to a point just OFF-SHORE of the city of Dunkirk (spelled 'Dunkerque', the French spelling). Clearly visible on the map are labels for "mine-nets" and "Ruttingen Shoal". A Shoal is an underwater land-form. The Nazi Commander then says "Something must have happened". Indeed ... he has the wrong map.
In most scenes, the bag containing the explosives bounces off King's leg as though it is empty.
Michael Wouters and Brent Roske are credited in main roles as well as background/ extras.
The evacuation of Dunkerque took place from May 26-June 4 1940. British paratroopers didn't exist at that time, they were formed June 22, 1940.
The British expeditionary forces did not drive around in American military vehicles, and especially not with US army markings on them.
German troops are seen wearing wearing uniforms from modern day army, with the green/ black/ brown combat fatigue pattern.
British troops are seen carrying Thompson sub-machine guns. These were not in use by the British army during the Dunkerque campaign.
The British expeditionary forces did not drive around in American military vehicles, and especially not with US army markings on them.
German troops are seen wearing wearing uniforms from modern day army, with the green/ black/ brown combat fatigue pattern.
British troops are seen carrying Thompson sub-machine guns. These were not in use by the British army during the Dunkerque campaign.
The plot occurs during May 1940, yet a Willys Jeep appears at 00:07:37. Such vehicles (by American Bantam, Willys-Overland and Ford) were not in existence at the time, and certainly not used by the British Expeditionary Force (BEF).
At 46:34 there is a "Drone" view of a little city, and there are modern day cars visible in the streets and even a parking lot.
When the rescue plane lands at the airport at the end of the movie, people and modern day vehicles are clearly visible.
When Strasser has the prisoners on their knees on the bridge, all his troops are standing around pointing their weapons at the prisoners. He has not set any men to watch for other British troops or Resistance fighters.
When the aircraft are attacking the Germans on the ground, the British party is running in the same direction as the Germans. The pilots would be unlikely to distinguish between the two groups. The British group would have most likely been attacked as well.
The group parks their vehicle beside the maize field in full view of overhead planes, making no attempt at camouflage nor even parking under nearby trees.
The soldiers walk through the maize field close together and in a line across the field, an easy target for enemy soldiers. They should be in single file, widely spaced, in order that they present a smaller target.
The accents of the British soldiers are inconsistent, often reverting to the actors' native US accents.
It is unlikely that Strasser, a front-line soldier, would have any idea of what the algorithm would be. His role would be to capture the person with the information and to turn him/ her over to technical experts.
Lt. Calloway refers to the men as "Mr. KIng", "Mr. Walker", etc. Officers would only refer to other officers in such a manner. Usually when talking to privates, they would just use the soldier's surname, and when talking to NCOs, they would use the rank (and surname).