Half way through the first episode and already caught two things that are not true.
1) The shows says Polish cavalry charged German tanks in 1939. Never happened, a long told myth.
2) Joseph Kennedy, JFK dad, show says he was an isolationist. Not really, he thought Adolph was a great guy and the US should work with him.
As a side note they say his son, John F. Kennedy supported European democracies. Nice way to gloss over the father's views and not take into account that JFK wasn't the focus of the Kennedy clan, Joe Jr. was, until he got killed in the war.
Good footage, like the shots of France '40, but history is a bit loose.
Another thing the film quickly covers is that the French/British were going to help Finland in the war against the Soviets. Yes, that is what the governments of England and France said, but the true objective of the whole operation was to occupy the Norwegian harbor of Narvik and the vast mountainous areas of the north-Swedish iron ore fields, from which it was assumed that the Third Reich received a large share of its iron ore.