Factual error: Company of Heroes is in the timeline of 1944-45. Soldiers are wearing the flag patch on their uniforms which have 50 stars on them, not 48. There were only 48 states in the U.S. back then.
Factual error: The American troops are using British .303 Lee-Enfield rifles: the U.S. Army's standard weapon was the M1 Garand rifle.
Factual error: During the shooting inside the freight yard, the soldiers ducks behind a pile of concrete sleepers, too modern for the era.
Factual error: There's a scene where a medic is giving CPR. CPR wasn't adopted by the US military until 1957.