- "Operation Kino": The film's central plot revolves around a Nazi premiere in Paris to watch a propaganda film about the assassination of Adolf Hitler. There was no such event in real life.
- Hitler and Goebbels both attending: Hitler rarely ventured outside Germany during the war, and he certainly would not have risked visiting Nazi-occupied France. Propaganda Minister Joseph Goebbels was known to be extremely afraid of flying and rarely left Berlin.
- The basement cinema: There is no evidence that Hitler had a private cinema in the basement of the Opéra Garnier in Paris, or anywhere else.
- The Basterds: While there were numerous Allied commando and partisan units operating behind enemy lines during the war, there is no evidence of any group that specialized in killing high-ranking Nazi leaders by scalping them.
- The German language: The actors playing Nazi characters often have inconsistent German accents, and the subtitles of some of the German dialogue do not accurately reflect what is being said.
- The British Commandos: The film's depiction of the British Commandos as ruthless killers is inaccurate. While the Commandos were a highly skilled and effective fighting force, they were also known for their discipline and professionalism.
- The ending: The film's conclusion, where the theater explodes with the Nazi high command inside, is fictional. In reality, Hitler survived the war until 1945 and died by suicide in Berlin.
It's important to note that Inglourious Basterds is a work of fiction, and historical accuracy was not the primary objective of the filmmakers. The film's primary purpose was to entertain and provide an alternative, fictional ending to World War II.