This production used an almost theatrical performance style during shooting. The performers stayed in costume and character from the start to the end of each day of filming. A set was used with solid (non-moving) walls and ceilings, to reinforce the reality of the setting, and eliminate any delays for changing camera or lighting setups. The action was filmed in extremely long sequences, sometimes 20 pages or more of script at a stretch, which is unusual in this type of production. However many of the actors have a Shakespearean background, and having to memorize this amount of dialogue was not a new experience for them. The production style required the use of the Super 16 film format. This was needed because of the longer film magazines available for those cameras, and also the smaller size, allowing the cameras to get in very close to the performers sitting around a conference table, the setting used for the bulk of the story.
Since detailed records of the Wannsee Conference did not survive World War II, minor details of the film (such as the seating arrangement at the conference table, what was actually served for lunch, and who was wearing a uniform compared to who wasn't) were totally up to the guess of the film's producers and not based on any historical evidence.
Apart from the record Eichmann plays at the end there is no music in the entire film.
The opening and closing of the film have Heydrich flying to and from the Wannsee Conference, which took place on January 20, 1942. However, Heydrich was officially grounded by Heinrich Himmler after he was shot down by Russian anti-aircraft in late 1941.