This topic is already starting to sound like the "Rules" from Scream...
Anyway...
One thing that does drive me nuts about Braveheart is the portrayal of Robert the Bruce. He didn't betray William Wallace at Falkirk. Hell, he wasn't even there. He actually grew up in the English court, so if her betrayed anyone it was England. At Bannockburn in 1314, he wasn't all dressed up in fancy armour either, he was actually armoured for something suitable for "reconnaissance" only and armed only with a small axe. An English Knight named Henry de Bohun spotted Bruce in this "disadvantaged" state with light armour and riding a small horse and charged. Bruce held his ground until the last second before side stepping and whacking Henry de Bohun with that small axe right between the eyes, both killing him and breaking the axe in the process in one of the most amazing combat baits in history. Bruce actually had to sit out the rest of the battle because he no longer had any means to defend himself.