I hope that they set the facts straight. Braveheart probably is a great adventure story and arousing for the Scots, it has very little to do with historical correct facts and events...
To begin with: William Wallace was not at all born in poverty, as depicted in the movie, but was a member of the Scottish aristocracy and already was a knight when he engaged in battle (and was not knighted afterwards as Braveheart suggests).
Isabelle de France was a 4 years old toddler in the time of William Wallaces military career. In the film however she helps Wallace by informing him of the English strategies, the affair and giving him pain-numbing medicine before his execution... Also Isabelle speaking French to keep things secret was nonsense as French was the standard language at the European Courts.
Sir Phillip (de Mowbray) was never thrown out of any castle windows but in fact lived well beyond his friend Edward II’s death.
The battle of Falkirk didn’t go down quite the way it’s depicted in the film but the most idiotic plot of course was that at no point the Scots and Irish did stop in the middle of the battle to shake hands and make nice. Pure fantasy...