Factual error: When the American team almost assassinates the vice-chancellor in the beginning, the German team comes in guns blazing. No special forces unit in the world would do that. They would have suppressed weapons, and use their ammunition diligently.
Factual error: The battalion commander wears the correct crown and pip of a lieutenant-colonel, but the four cuff rings of a full colonel (lieutenant-colonels wore three).
Factual error: LtCol Baisley has his name and U.S. Army patches on the wrong side of his uniform. He has the Army patch on his right side instead of on the left. (00:33:00)
Factual error: The Navy Seals call in air support and provide a fire mission to given coordinates. The targets are engaged with rockets and gatling/chain guns. The UH-60 Black Hawk is shown leaving after the air strike. This UH-60 however only had mini-guns in the doors. The type of UH-60 needed for this action would be the UH-60 DAP, which is configured as a gunship and has no troop carrying capacity. The DAP can carry chain guns, mini-guns, missiles and or rockets. (00:03:00 - 00:03:23)
Factual error: Helmuth von Moltke is addressed and referred to several times as Field Marshal. He wasn't promoted to that rank until 1871. He was a lieutenant-general during the Second Schleswig War in 1864.
Factual error: The real RAF chief meteorologist was Group Captain Stagg. For some reason, he is the only character in the series who has been fictionalised, as Captain Burns. However Captain is not an RAF rank. Unlike the fictional Burns, Stagg was not a pilot and had no medal ribbons (he had no previous military service before receiving a war commission for his meteorological skills).
Factual error: They show a clip of a kamikaze diving into a ship. The clip they show was actually an event from much later in the war: offshore of Okinawa. No ship on either side was struck by a plane during the Battle of Midway.