I saw one about WW1... If I wrote half of the stuff they claimed there on my history essay I'd get 0 points, probably. They always exaggarate tremendously the american involvement, also they like to say that their involvement is always because of moral issues... Which is hardly ever true when a nation joins war. Yes, it is a factor, but only one, and not too significant one.

Also I saw the one about the Monte Cassino bombing. They claimed that it was justified. However, all the reports I have read, say that germans specifically withdrew all troops from there because they didn't want it to be a target. However americans sent massive bomb strike against it, leveling the europes oldest monastery, a great cultural treasure.
I haven't read of anyone else but americans claiming there being germans in that place prior to bombing, I only know that germans moved in troops after the bombing, which caused heavy casualties to americans, as the ruined monastery proved to be a good fort. On that documentary they didn't mention even once this possibility that it could've been completely empty- instead they claimed there was no possibility of it being empty.
That is something that professional historians don't do, that is what propagandists do.