Visible crew/equipment: In the execution scene at the end, right as Wallace is being quartered, you can clearly see (on widescreen) a plastic spray bottle on the upper left part of the screen, presumably filled with fake blood.
Suggested correction: This is absolute rubbish. Even on wide screen. The main reason for this being is we are never shown him being quartered. We see the executioner bringing the axe down to behead Wallace but that's where it all ends. The next scene is on a battlefield. Yes, we are told he was quartered but not shown. Being beheaded is not being quartered. For obvious reasons.
Continuity mistake: During the scene in which William Wallace is being executed, the camera pans the crowd and shows the ragged peasants staring in silence. An extra, who is a young woman with light hair and a dirty face and is standing near the front of the shot, stares directly at the camera for a few seconds while all the other extras look in a different direction towards the execution. (02:44:00)
Suggested correction: That is purposely done. It is meant to show her locking eyes with Wallace.
Continuity mistake: During the first major battle scene, Wallace's sword has a leather looking binding around the blade at the hilt. As the battle progresses, the binding moves a third of the way down the blade and then back again.
Suggested correction: They're supposed to move. It's there so the sword can be held by the blade and the hilt in close-combat scenarios.
Other mistake: In one of the very last scenes of the movie, when William's friend Hamish takes out William's sword to throw it as a sign of honor for William, when Hamish extends his arm back to throw the sword he only takes a step or 2, but he does not hit any of the men standing in formation directly behind him with this 5 foot long sword.
Suggested correction: The blade on a claymore is 43 in which is 3.5ft. The men behind him were more than 3.5ft away. Plus, when he swings the sword, his arm isn't parallel to the ground, the sword is pointing towards the ground at first.
Continuity mistake: In Wallace's father's burial scene, when the young girl goes to give William the thistle, the camera goes to just their hands which are supposed to be those of young children. They are however clearly the hands of an adult woman and man.
Suggested correction: Just watched this scene. The hands are far too small to be those of an adult. The size of the thistle gives it away. Oh, and the fact that you can see the children's bodies.
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.
Suggested correction: Of course they were out. It would have been pointless to still have them covered when the charge was under way and the cavalry were so close.
Other mistake: At the end of the movie when Wallace is being executed and the crowd starts chanting "Mercy," one girl towards the front left looks directly at the camera with her eyes twice in two different shots.
Suggested correction: Yes, it was done on purpose. It is the same child he locked eyes with prior to being hanged and while he is being disembowelled.
Revealing mistake: In the scene where Princess Isabelle gives Wallace the remedy to dull his senses, she pours the liquid in his mouth and then kisses him. Then on her way out, you can see Wallace swallowing before he spits out what is supposed to be the poison.
Suggested correction: Yes, you can swallow with a small amount of liquid in your mouth and not ingest the liquid. Not a mistake.
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?
Suggested correction: The scene was obviously clipped to save time. His lower body isn't held to the ground, it's pulled outwards by a couple of horses. The executioners hold ropes attached to his wrists.
Other mistake: Near the end of the battle of Sterling after Wallace nearly hits one of his allies on the horse, look on the right side of the shot. An English man wearing metal armor is fighting some Scots. He doesn't make much effort, barely swinging his sword. The Scots fighting him also don't put up much of a challenge either.
Suggested correction: Because they're exhausted.
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)
Suggested correction: You answered your own correction, it isn't the same man.
Continuity mistake: When Mel Gibson is disembowelled, in one shot there's no blood on his neck, but in the very next shot there is.
Suggested correction: Could that be because in the first scene his shirt is torn open, and they haven't started the disembowelment. Then they start the process and blood spurts up across his chest and neck?