Trivia: There are only two women with speaking parts in the whole film, with 47 words between them.
Trivia: In reality, Adolf Hitler ordered his commanders and troops to stand down and allow Allied forces to escape at Dunkirk. The German General von Blumentritt is quoted as saying "He (Hitler) then astonished us by speaking with admiration of the British Empire, of the necessity for its existence, and of the civilisation that Britain had brought into the world...He said that all he wanted from Britain was that she should acknowledge Germany's position on the Continent." But the exact reason for the order remains unknown.
Suggested correction: Hitler's controversial 'halt' order at Dunkirk had nothing to do with chivalry. The most widely accepted reason for the order is that the Wehrmacht Panzer units have been fighting continuously for two weeks, and badly needed some rest in preparation for Fall rot, phase two of the invasion of France. Infantry and air power continued to attack the Dunkirk pocket throughout the evacuation while the armoured units rested.
Trivia: Michael Caine has an uncredited voice cameo as the voice of Fortis Leader, the lead Spitfire pilot who gets shot down early on.
Trivia: The blind man who greets the soldiers upon returning home is played by John Nolan, Christopher Nolan's uncle.