It is remarkably accurate in certain aspects. Nolan 'fessed to a few inaccuracies from the bat - the Yellow nose on the Me 109 for example. But the Tom Hardy’s Spitfire, for example, was purely magical.
To be fair there was a fair impression of the amounts of kit abandoned, The vehicles being used as piers, row upon row of rifle lining the wall on the approach to the hospital ship. Vehicles parked at the top of the beach abandoned. On the flip, don’t you think Dunkirk just looked picturesque for a city being bombed, shelled and mortared?
I know that speech inside and out, I was reciting it along with it… apart from adding the Churchillian enthusiasm around “with growing confidence and strength in the air”. It was quite nice seeing it in context mind. But still, it was a minor detail at the end that has me cock my head like a puppy and laugh - the spell broken. Where’s the engine block?