Factual error: In the opening scene, the German soldiers are searching the Americans. They remove a package of Lucky Strike cigarettes from one of the Americans. This package has the red circle against the green background. Green ink was stopped in 1942 because it uses chromium for green pigment which was necessary for war production of steel. Slogan "Lucky Strike Greens Has Gone to War" was a big advertisement in 1942 with introduction of white background on package.
Continuity mistake: When they first get into the jeep with the German flag attached to the hood it does not have chains on the front right tire, later it does.
Factual error: The beginning of this movie is based on an actual historical occurrence. On December 17th 1944, SS troops of the 1st SS Panzer Division did kill a substantial number of US POWs in a field a few miles away from Malmedy, Belgium. The G.I POWs and main characters in the movie are shown as being members of the 101st Airborne. The problem is the 101st was nowhere near the Malmedy area during any part of the Battle of the Bulge and, indeed, were still in their staging base at Mourmelon, France when the "Malmedy Massacre" took place.
Question: We all assume, as I did when watching the movie, that the opening scene really was intended to be the Malmedy massacre. Could it have been that they were just hinting towards that, and that the opening scene (with the array of mixed Wehrmacht and SS, 101st Airborne and other which is historically not matching Malmedy) was simply another incident? Did the director ever intend to create a grossly false Malmedy scene? There were quite a lot more atrocities in that area and time, with executions of prisoners by both sides.