A man comes out of the water holding a fish. After the scene cuts and he is addressing the Japanese soldier, his clothes are still wet, but his hair and face are not.
The text after the opening credits begins "An Asian man wearing a German uniform was discovered by the U.S. Military at Normandy on the D-Day, 1945..." D-Day was June 6, 1944.
At the end of the movie when Tatsuo and Kim Jong-Sik look up into the sky, they see American paratroopers overhead. As part of Operation Overlord, paratroopers were dropped prior to the beach head invasions not during them.
Allied aircraft participating in the Normandy invasion had black and white invasion stripes painted on the wings and fuselage. The Allied aircraft shown here are missing these.
There are Iowa class Battleships shown as part of the invasion fleet at Normandy. Not only were Iowa class Battleships not present in the actual invasion, but the ships shown in the film appear in their 1980s configuration.
There are inconsistencies in how events are presented in relation to actual historical events. A Soviet officer tells Colonel Hasegawa that the Japanese government wouldn't arrange a prisoner exchange because they were fighting the Americans, which would place events after December 7, 1941. Later, the Japanese POWs are told that the Germans have just invaded Russia and they are needed to fight them. However, it in the middle of winter yet the Germans invaded in June 1941 - six months before the Japanese attack on Pearl Harbor.
During the Normandy's beach shelling scene, the CG model of a battleship shows its hull number mirrored.
The Soviet aeroplane that the Chinese woman managed to shoot down with a rifle mortally wounded her with machine gun fire from it's wings. This type of aeroplane was always equipped with 23mm ShVAK cannons in the wings, not machine guns, which would have ripped her apart and killed her instantly rather than mortally wounded her.
As Jun-Shik finds a large wound, clear water is evidently spurting out instead of blood.
When the beaches of Normandy come under aerial attack, the distinctive sound of a Carter-Gents air raid siren - used by the Allies - can be heard. The Germans used a deeper-pitched siren.
Second title card reads, this story is based on true "evnets."
The German officer who addresses his troops at Normandy has hair cascading from under his cap all the way down to his shoulders. A hairstyle like this wouldn't have been seen on men in the 1940s, let alone on an officer in the German Army.
In the opening marathon scene, the American flag shown on the side of the road is the 50-star version introduced in 1960; during the 1948 Olympics, the flag would have been identical to that used in WWII with 48 stars. In the closing marathon scene, one of the marathoners (#198) has a Canadian maple leaf flag on his jersey which was not Canada's flag until 1965.
B-17 Flying Fortresses are seen as the only Allied bomber to bomb the beaches on 06 June 1944, when many Allied aircraft did so. Furthermore, one of the CGI B-17s wears the group and aircraft letters ("DF A") of the "Memphis Belle" circa Spring 1943. The "Belle" of course was back in the USA in June 1944, and all American aircraft wore different insignia than the 1943 ones shown.
During the 1948 Olympics scene a flag of the German republic can be seen (black, red, yellow) while Germany was not only not allowed to the Olympics but was also still under allied occupation and thus didn't have a flag.
Some of the American M1 Carbines have a small rectangular block on their barrels; this is a bayonet lug, not seen on these weapons until the Korean War, or at least very late in the war.
During the Battle of Normandy sequence, the sound of the German MG42 firing does not match that of an actual MG42.
Jun Shik & Tetsuo are seen struggling to cross mountains as they flee Soviet captivity. However, the only mountains in central European Russia are to the east, the Urals. If they are heading west as stated, the first mountain range would be the Carpathians in German-allied Romania or German-occupied Poland.