Dunkirk (2017)

Factual error: When the returning soldiers are on the train at the end of the film, it's an open plan post-war British Rail Mark I type, which where built from around 1950. Also the blue upholstery on the seats looks to be the corporate blue introduced by British Rail in the 1960s, used by the preserved railway owning the stock, and not what would have featured in Southern Railway carriages of the time. The carriages also have horizontally-sliding windows, which are far more contemporary than wartime trains, which had windows with a much larger vertical opening, held in place by a leather strap.

Trivia: Despite his prominent billing, Tom Hardy is only in the film for 10 minutes.

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?