This one is full of nonsense that unfortunately bolstered the Scottish nationalists. My father was a Scotsman, and his loathing of the Scottish nationalists was the stuff of legend.
Having said that, I have never regarded Braveheart as history but as myth. It plays up the myth of William Wallace, though it doesn't romanticise the bloody realism of medieval warfare. But for me, it is one step away from The Adventures of Robin Hood in terms of historical accuracy.