Factual error: In the conference between Feldmarshalls Rundstedt and Model, they decide to move the 2nd SS Panzer Division, under Bittrich, to Arnhem to refit before fighting Patton's anticipated attack. Actually, it was Bittrich's II SS Panzer Korps (with the 9th and 10th SS Panzer Divisions) that were at Arnhem. The 2nd SS Panzer Division did not fight at Arnhem.
Continuity mistake: When they're building the Bailey bridge to replace the destroyed Son bridge, work continues into the night. Cut to scene of a soldier waiting for them to complete the bridge - in daylight. Cut back to the continuing work on the bridge - it's dark again.
Factual error: The shot of a tank wreck being pushed off the road following the first tank battle shows a Chaffee light tank, which was only used by the Americans and not the British. Anyway, it was first used in Europe in November 1944 after Operation Market Garden took place.
Factual error: As they storm the bridge there is a row of modern sodium street lights prominently visible that didn't arrive until the 70s.
Chosen answer: The Germans did use some Hitler youth movement in the war.