Zyklon B were pellets not a liquid as shown in the movie. In addition, the pellets were dropped through an opening in the top of the chamber and the body heat turned them into a gas. A motor was not required.
Rudolph Hoess (John Banner) is depicted as an SS Standartenfuhrer (Colonel) early in the war. At the time; he was actually an SS Sturmbannfuhrer (Major) and only made Obersturmbannfuhrer (Lt Col) at the end of the war.
Felsner (Theodore Marcuse) is addressed as and cast as a Captain. His uniform collar has the four pips of an SS Sturmbannfuehrer (Major)
The portrait of Heinrich Himmler, seen in Felsner's Dachau office,
is from TIME Magazine Cover Apr 24, 1939
and it is made by American artist Ernest Hamlin Baker.
If there would have been a portrait of Himmler, it would have been one
the official photographic portraits.
Eichmann says he got rid of his SS Nr. 888 653 and "cut it out with a knife".
SS men didn't have their SS numbers tattooed but their blood group.
Eichmann's real SS Nr. was 45,326.
The sleeve eagle insignia worn by the SS officers are inaccurate. They're regular Army insignia that would be worn on the right breast of the uniform; The SS eagles worn on the sleeves have more pointed wings.
Ruta Lee's WWII and post-WWII hair style is strictly 1961.
The sequences supposedly taking place in Buenos Aires are obvious, easily identifiable Los Angeles locations, such as the intersection of Sepuveda and Sunset Boulevards.
When the characters talk of relocating Eichmann to Kuwait, it is described as an island in the Persian Gulf. Kuwait is not an island.