I think everyone has become blinded to the glaring errors in Dunkirk by the intensity of the subject. Although the cinematography was impressive with the close-up shots of relentless life threatening scenes that the young soldiers were experiencing, the basics of film making had been completely ignored - very bizarre. I spent most of the film wondering how in the same day, and the same ten minutes of a scene, we saw soldiers sitting on a beach in a storm which was wild enough to throw up a beach full of foam, and in the adjoining scene, boats sailing on millpond waters with a blue sky behind them. Then the next shot would be Kenneth Brannagh staring out to see into a sea fog and obviously freezing weather, only to be juxtaposed with another brilliant blue sky and sea. It was so glaringly bad that I couldn't actually concentrate on the film itself.
Shots of the soldiers on the beach looked as if they had got a few blokes from the local town to line up rather than the 400,000 of them who were there for heavens sake. The same issue arose with the fleet of small boats coming from England to collect the soldiers - couldn't they have gathered more than the dozen that they showed? There were hundreds and hundreds of them in the rescue. Really skimpy and unbelievable.
The CGI of looking down on the spitfire which was landing on the beach was so bad that it could only have been surpassed by having a cut-out waved about on a string.
My partner also told me that the train carriage in which the soldiers were taken home was also not produced until 1955.