1970s train at the end
I'm assuming films like this have historical advisers to make sure everything is accurate.
So why did they show, for several minutes at the end, the soldiers on a 1970s British Rail train carriage?
You can tell it's from that era because it's open plan (nearly all British trains were compartment trains in 1940) a large window and white plastic walls, and it even has a formica table!
There are several working historical railways in the UK and it would be very easy to film a proper 1940s train on them.
For a train buff like me, it's as bad as showing the RAF flying jet planes or the soldiers all carrying 1950s SLR rifles!