Factual error: Prochnow is addressed as "Major," in English, but he wears the collar tabs of an SS lieutenant colonel. He should've been addressed as "Obersturmbannfuhrer," or, in English, as "Colonel," because lieutenant colonels are acceptably addressed as "Colonel," as are full colonels.
Factual error: In the interrogation scene with Carravaggio, the German officer is addressed by the private Wehrmacht soldier as "Herr major". The officer is SS. By his shoulder patches he indeed has the equivalent rank of a major, but the correct SS rank is "Sturmbannführer". SS officers were never addressed as "Herr", but simply with the rank.