When Heydrich announces that from "England, from Lapland to Libya, from Vladivostok to Belfast: no Jews. Not one", the others knock on the table with approval. At the point, Kritzinger can be seen standing and looking out of the window, but a split second later he is seated again.
When Klopfer asks "How many lawyers are there at the table? Raise your hand", Rudolf Lange is seen raising his hand twice in two different shots.
When Lt. General Hoffman arrives at the conference, he is wearing an overcoat. When he leaves the conference, the overcoat is missing.
Just before General Hofmann becomes ill and excuses himself, Adolf Eichman lights his cigarette twice.
As Heydrich's car approaches the house a shot from the rear shows a clearly displayed D sticker to the right of the license plate but a matter of seconds later as the vehicle pulls up in front of the house the sticker has disappeared.
In the beginning of the film, the narrator refers to the death of Hitler's best general who died of a heart attack in Russia. The narrator is most likely referring to Field Marshal von Reichenau, who died on January 17, 1942. However, Reichenau suffered a stroke and not a heart attack. He was being transported to seek medical attention when his aircraft crashed on landing. He suffered head injuries during the crash and died. The actual cause of death was not determined.
All of the characters in the movie who wear wedding rings wear them on their left hand, as is the custom in England and the U.S., where the actors are from. Germans and Austrians wear their wedding rings on their right hands.
As the attendees discuss the Soviet counterattack on the Moscow front, they mention the death of Field Marshal von Reichenau and his replacement by a general "who has never commanded one damn brigade" (a reference to General Paulus). Reichenau was the commander of the Sixth Army which was part of Army Group South, and was in no way involved in the battles on the Moscow front.
There are several factual errors in the rank insignia of the participants: Heydrich should only have one 'pip' on his shoulder boards; Stan Tucci's character should have gold shoulder boards; other ranks represented on the characters didn't even exist in the SS.
Klopfer is portrayed as seriously obese and displaying a lack of tact foul enough to make even the other Nazis uncomfortable, yet in real life Gerhard Klopfer was slim-built, and his co-workers remembered him as a calm and usually very polite man. However, this is likely a deliberate error by the filmmakers, as they have stated that they wanted to combine Klopfer with his superior, Martin Bormann, who was, as depicted, obese, rude, self-important and arrogant.
The meeting takes place in the dead of winter, but when anyone walks out to smoke or speak, you never see their breath.
At the beginning of the film, place cards are being made using the traditional Germanic Gothic, or "Fraktur" font. Although the font was initially used by the Nazis, it was claimed in 1941 to be "Judenlettern" (Jewish letters) by Martin Bormann himself, who banned its use. The movie takes place in 1942.
Lt. Colonel Eichmann speaks of the involuntary euthanasia program that he calls the T-4 program. Tha term T-4 program, a.k.a Aktion T-4, is a term that was coined after the end of World War II. The name T-4 is an abbreviation of Tiergartenstraße 4, a street address of the Chancellery department set up in early 1940, in the Berlin borough of Tiergarten, which recruited and paid personnel associated with T-4.
When Dr. Kritzinger leaves the meeting for the first time to go outside, the camera is by a parked car at the front of the Wannsee Conference house. As the camera moves past the car, a crew member can be seen reflected by the car's polished paintwork.
The conference takes a break when General Hoffman becomes ill. Upon returning, Lt. Colonel Eichmann mistakenly refers to Dr. Roland Freisler as "General Freisler." Freisler served in the German army, but never obtained the rank of general.