Continuity mistake: During the funeral scene for Wallace's wife we see the leader of the group of Scots that show up later in the film (after the attack on the local fort). Nobody seemed to know him but he was at the funeral with all of them...
Continuity mistake: Near the beginning when the boy is waiting for the men to return and he has the bucket of water, you hear the water slosh but the scrawny boy runs so effortlessly with it and you never hear it slosh again. Then when he is at the fence with his back to them, you see the bottom of the bucket is wet, but there's no water in it. (00:09:30)
Continuity mistake: When the spy was trying to kill Wallace, he was seen swinging his sword forward. The shot cut to Stephen throwing his knife. When the shot cut back to the spy being hit by Stephen's knife, he was pulling back his sword to get ready for a forward swing. What? Did he miss on his first attempt and had to try again?
Continuity mistake: When Philip is thrown out the window by King Edward we see him flipping over in the air so that he will hit the ground on his back. But when the camera changes to the window view we see that Philip is lying on his front.
Continuity mistake: Watch the group of English soldiers that ride out to present the King's terms at Stirling. After Wallace insults them, they turn around and begin to leave. The sounds of their horses riding off are very audible. After Wallace's talk with the three nobles, their group breaks up and begins to ride back. A panoramic shot of the field is shown and the English representatives have just started to leave.
Continuity mistake: In the battle scene where they flanked their forces and and were going to use the long wooden spears on England's knights, they already had the spears out when it showed England's horses coming closer. Just look around them. It only shows for a second when it is zooming in pretty fast.
Continuity mistake: Near the end of the battle of Stirling (the first big one), an English officer on a horse comes at Wallace. Wallace swings his sword at the feet of the horse, knocking it and the officer down. As the officer falls his sword goes from one hand to the other several times.
Continuity mistake: In the scene where Wallace surrenders to the local magistrate, after Wallace has struck the English soldier that was holding the reigns of the horse, a second soldier attacks the horse with a spear. The spearhead is seen as the soldier starts the attack, after the cut the spearhead is gone, before it strikes the horse. The un-headed spear then hits the harness of the horse where it sticks as the horse rears, and the harness moves from the front of the horse's neck between the legs of the horse to the side, somehow passing through the raised legs of the horse. (00:49:20)
Continuity mistake: When Wallace is saved by Steven, right after he meets him, watch Steven as he is about to throw the small sword. When he comes out of the brush and starts running, he gets past the two trees in front of him, then it cuts to Wallace aiming his bow at him, then it cuts back to Steven and he is back behind the trees.
Continuity mistake: At the wedding scene near the beginning of the film, Wallace challenges Hamish to throw a large rock at him. He throws the rock, and in slow motion the rock is clearly on Wallace's left side; he even leans a little to his right as the rock starts to pass by on his left. But in the next angle the rock is very clearly on his right. (00:21:10)
Continuity mistake: At the end of the movie the executioner bends down to bind William's feet. The scene shows the rope starting around his feet and then a second later William is yanked into the air with a complicated noose-like knot holding his lower body to the ground. How did they make that knot so fast?
Continuity mistake: When Wallace pounds an English soldier with a large mallet, in the village where his wife was killed, watch the third hit. Wallace hits the soldier in the hip and then in the back. On the third hit, the mallet comes down at least an inch or two from the soldiers head, missing. The soldier jumps as if he was hit.
Continuity mistake: In the first battle where Wallace is attacking the palisades and he is riding slowly, pretending to be unarmed and later draws a morning star/flail from behind his hair, the morning star/flail obviously isn't there until he needs it.
Continuity mistake: At Stirling when the Scottish attack on horse, there is a scene where an Englishman is being sliced by a sword and is quite bloody. Then it cuts to him being run over by two horses and you can see that it is not the same man nor are there any traces of blood on him. Then it cuts to him falling to the ground and he is again quite bloody. (01:26:50)
Continuity mistake: When Wallace is a boy and they are at the grave to bury his father and brother, the shovels of dirt shake the wrapped dummy body in the grave.
Continuity mistake: After being knighted, William says that he will invade England. In the close-up shots of Robert in the group reacting to him saying this, you can see the man whose bride was taken away by the English lord earlier in the film behind him. But, in the wide shots, he's not there. It's just some random man behind him.
Continuity mistake: After Wallace kills the noble and his crew for killing his wife there's blood on his face. At the funeral there is no blood on his face. The night of the funeral the blood on his face returns.