Factual error: The parachute flare was not invented till 1922. This film takes place in 1918 but features one. (00:21:15)
Factual error: The tank used by the German platoon is a Soviet T54/55, which didn't come into service until 1948, after the Lapland War had ended.
Factual error: When Lt. Tom tries to make up for reporting the insubordination of Ensign Brown during the bridge attack his insignia is only one bar but should be two bars for a lieutenant.
Suggested correction: Technically, it's not incorrect to call him a Lieutenant. His rank is Lieutenant Junior Grade (marked by a single Silver Bar), and a 1st Lieutenant is marked by 2 Silver Bars. The term is usually transparent amongst this rank, it's not uncommon for a LTJG and a 1LT to both be called a Lieutenant.