Cracking series and a great soundtrack! The series would have been deadly-dull to a younger audience if they'd used era-appropriate language and music (the King's English and Dame Vera Lynn??).
Also, apart from the mil history wonks who cares about the historical inaccuracies? There's a zillion books on the subject if you want to dig deeper, which I'm sure many people will now do on the back of this.
For me the outstanding part is the dialogue. Some of it is genius.