I've watched the movie 9 times, and I've heard about all these slip ups, but never actually seen them. Anyone wanna enlighten me?

1. Apparently there is a red lorry (truck) in the highlands, in the background, in one of the shots. I've looked extensively for this one and haven't found it.

2. The executioner is wearing sneakers/tennis shoes.

3. In the battle scenes you can spot people wearing glasses and watches.

4. William Wallace's best friend's dad (sorry, forgot his name) get's his arm chopped off in one of the later battles. In the next shot it has miraculously grown back on, only to be off again in the preceeding shot.