In the battle of Lundtoftbjerg(1940), a German soldier is equipped with a MG42 machine gun (developed in 1942).
(at around 55 mins) There is someone in the background passing on a bicycle, wearing something red. It appears to be someone riding a modern day mountain bike.
(at around 38 mins) The Germans are firing an MG 42 in a battle in 1940.
This took place in 1940 but in the movie German troops have MG 42 that was first introduced into the German army in 1942.