Character mistake: The story arc set on the Mole covers one week. The Highlanders attempt to refloat the beached trawler on the last day of that week. One of them confidently states that the tides are three-hourly. (The audience know this isn't true because we've seen a similar conversation between the Admiral and the Colonel.) At least some - if not all - of those Tommies have been on the beach all week. Have none of them have noticed that the tides are six-hourly?
Dunkirk (2017)
1 character mistake
Directed by: Christopher Nolan
Starring: Kenneth Branagh, Tom Hardy, Cillian Murphy, Mark Rylance
Deliberate mistake: The Messerschmitts have painted yellow fronts, this wasn't done by the Germans until after Dunkirk. Christopher Nolan has admitted doing this deliberately so the audience could tell the difference between the Spitfire and the Messerschmitt during the combat scenes.
Commander Bolton: Well, we'll know in six hours' time.
Colonel Winnant: I thought the tides are every three.
Commander Bolton: Then it's a good that you're Army and I'm Navy, isn't it?
Question: A few minutes into the movie you see English troops all lined-up on the beach with no obvious means of evacuation. That leaves them very exposed to German gunfire and aerial attack. It would seem that the English soldiers would stay off the beach until actually called-up for evacuation. Not to mention the obvious requirement that some troops would have to stay off the beach to defend the evacuation area. How realistic are those scenes?
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Answer: That's exactly how it was. If you search for images of the evacuation, the troops were stood in lines, waiting to be evacuated. The Germans were held at bay, and the air raids were periodic, so there was little risk on the beaches.