One soldier is carrying an American 1928 model Thompson and magazine pouches, that would never been used in the Eastern front, as ammo would be next to impossible to get as the U.S. was the only army using that caliber.
The only German in this movie who doesn't have a strong English accent is one actor who has a strong Irish accent.
Chronologically misplaced map in the opening sequence showing European countries that were not in existence until the 1990's; namely Czech Republic and Slovakia. Also, Belarus and Serbia would not be marked territories on a map in use in 1944 and Russia was still part of the Union of Soviet Socialist Republics (USSR).