In the opening scene Lassen has blood all over the front of his shirt after killing a bunch of the German sailors. After they blow up the German patrol boat the blood is suddenly gone from Lassen's shirt.
At 45:48 into the movie, as Heinrich and Marjorie are sitting at a table in Herons' Casino Bar, Heinrich opens his cigarette holder in which there are 10 cigarettes. In the next shot, after he's taken one out, there are only 8 cigarettes left instead of 9.
"Mack The Knife," from Bertolt Brecht's leftist play The Threepenny Opera, plays twice in Nazi company. Brecht was a communist who fled Nazi Germany, and The Threepenny Opera was in fact banned by the Nazis for being "degenerate art."
The British destroyer is pictured as having is bridge enclosed by windows. British warships of that era had open bridges, exposing the crew to the elements.
The British "Destroyer" had 3 gun turrets where most destroyers had either 1 or 2 gun turrets. The British light cruisers of the Minotaur Class and the Fiji classes all had 3 gun turrets. However, the Minotaur did not carry depth charges and the Fiji class was not introduced until 1943.
During a German air raid over London, Prime Minister Winston Churchill is staying at his official residence located at 10 Downing Street in London, risking being killed in the bombing. During the war and especially during air raids, Churchill and all essential British military and government staff worked and slept in a huge underground shelter complex in London.
During the raid to steal the freighter which is fully loaded and further weighted down with extra armor the men tow the freighter with only one tugboat, despite having stolen two more tugboats. Once they were clear of the harbor and its breakwater they would have needed the two other tugboats to tow the ship because of currents and weather.
Luhr says "Horowitz and Meyer, West 47th Street. Have you heard of them?"
Marjorie responds, "I am familiar, of course, with Horowitz and Haim.
But they're in the WEST side of the city."
West 47th street is, of course, ON the west side.
West 47th street is, of course, ON the west side.
When Henry Cavill is talking to Cary Elwes about the mission, he reaches into a box of cigars. The cigars are Fuente OpusX, which weren't produced until 1995. Churchill also only smoked Cuban cigars, usually Romeo y Julieta.
The Duchessa and various other boats in the movie, like the tugboats, appear to be quite a bit newer/more modern than the film's 1940s setting.
The cigarette lighters used by both Heinrich and Marjorie are fuelled by liquefied gas that was only adopted in the 1950s.
The S.T. Dupont lighter that m. Stewart is using with the iconic "Cling" sound was not produced before 1941.
Gustavus "Gus" March-Phillipps, as seen here, spelled his last name with three 'P' and not two, as the movie claims.
When Churchill is explaining the mission he says "If they're captured by the British..." but Fernando Po is under Spanish control.