Factual error: At German Army headquarters, the General tells Hessler of the new Tiger tanks that will be used in the offensive, which takes place mid-December 1944. Presumably, these are the Tiger II (King or Royal Tiger) models. At this point in the war, "King" Tigers were not new, having fought against the British and Canadians in Normandy back in July of 1944, and against the Americans at Aachen in September of 1944.
Continuity mistake: In the initial German panzer attack against the Americans, a German tank 104's left side track and road wheels are damaged by a bazooka shell, resulting in a missing front road wheel and a loose/sagging track. However, when the tank turns off the road and goes down the slope, the left track is taut and the missing road wheel has magically appeared.