Continuity mistake: When Thomas is sitting by the window painting his tin figure he looks out the window while holding his brush away from the figure. When it cuts to close-up the brush is on the figure. (00:21:40)
Continuity mistake: When Thomas is shot, the entry and exit wounds are the same height. SInce the shooter was on horseback, the exit wound should be lower. (00:29:15)
Continuity mistake: When Gabriel is sitting in the snow writing a letter, we see a close up of a quill pen. Then, in the next shot, the writing implement looks more like a pencil than a quill pen. And wouldn't it be a trick to sit in the snow with a bottle of ink?
Continuity mistake: After the Green Dragoons burn the people in the church, the Militia chases them to the riverbank. Col. Tavington shoots Rev. Oliver who falls to his knees holding his rifle with the barrel to the right. Rev. Oliver throws the rifle up for Gabriel to catch, but now the barrel is pointing to the left.
Continuity mistake: Another mistake in the scene for the battle of Cowpens involves Benjamin Martin charging at Colonel Tavington. As Benjamin charges, the camera shows him from the front and you see he is gripping the flag with one hand, his right. The camera then cuts to a different view to show Colonel Tavington on horse back charging towards Benjamin. Although Benjamin is slightly out of focus, you can see that he is now carrying the flag across his body with two hands (Flag towards Benjamin's left). The camera then shifts again to show Benjamin from the front and you now see him shift the flag from a one handed grip to a two handed grip.
Continuity mistake: Right after the scene where Benjamin Martin attacks the British army for the very first time to save his son, Col. William Tavington is interviewing the only survivor of the attack in a tent in a British camp. His green collar keeps popping in and out from under his leather strap over his right shoulder.
Continuity mistake: When Gabriel wakes up after having had his wound treated he lifts his hand, covering his eyes. When it cuts his hand is suddenly on his forehead. (00:24:35)
Continuity mistake: At the end when they are returning to the homestead, in one shot, Charlotte holds a baby in her left arm, followed by a shot of one of the boys. In that shot, Charlotte's left arm is hanging to her side with no baby.
Continuity mistake: When Gabriel is pulling his knife out of the dead British soldier, there is a long piece of grass on it. It shows Col. Tavington's body on the ground, then it shows Gabriel holding his knife again, and the piece of grass is gone. He is also standing in the same position as before, so it seems unlikely that he pulled the grass off the blade.
Continuity mistake: After Benjamin and his sons ambush the British troops, a surviving British soldier is holding a knife to the left side of Gabriel's neck threatening to kill him. Benjamin throws his axe in the soldier's head, and he falls to the ground, but cuts Gabriel on the neck. As he falls, the knife drags along the left side of Gabriel's neck, but the cut is on the right side of his neck.
Continuity mistake: Tavington does a fast reload and adopts a duelist's stance, i.e. side on so as to make a smaller target. Gabriel shoots him and Tavington falls. We later see that Tavington is only creased on his left side which is strange since Gabriel could not have hit him there since it was the side farthest away from him.
Continuity mistake: After Garbriel gets married, there was a wedding party. During the party you can see a slave playing a xylophone-type instrument while a boy stands next to him. However, when Benjamin is talking to his new daughter-in-law, the slave can be seen in the background while the boy is nowhere to be found.
Continuity mistake: In the battle scene where the cannonball rolls through taking out the troops legs. Watch it frame-by-frame, two legs are shown close up to be taken out by the cannonball. Both explode at the time it passes through the first leg, not as it hits each one.
Continuity mistake: When Gabriel dies his head is facing straight up looking at the sky. then they cut the scene and show Ben then they show Gabriel again and this time he is facing his father.
Continuity mistake: As Benjamin's milita walk onto the battlefield on the morning of the final battle, we see many shots of the soldiers. One soldier has a bloody bandage around his forehead and blood running down his face. This is early morning and there didn't seem to be a battle the previous day. Why is he bleeding, and why wasn't it cleaned up during the night?
Continuity mistake: This mistake is painfully speculative. A British soldier falls "as if he was hit with Benjamin's bullet" but this is not shown definitely, even submitter is not sure. Ends with a question, "How did he reload his gun so fast?" Because he has extensive military experience. Because the shot may not have represented real time. Because his life depended on it. Because he may have had a second gun. If submitter does not know these things for sure, how can this possibly be a valid mistake?
Continuity mistake: In the scene where Benjamin is saying goodbye and asking Susan to speak to him, Charlotte (standing beside Susan) puts her hand on Susan's back. In the shots of Susan (from the front), the hand remains on the back throughout the scene. In the shots from behind her (showing Benjamin's face), the hand is not on her back. There are several back-and-forths.
Continuity mistake: In the scene when Benjamin's previously silent daughter runs to him - to say that she loves him and wants him to come back, there's a continuity error in the location of her pigtails. When the camera is at her back, they're behind her head and when the camera faces her, they're in front over her shoulders.
Continuity mistake: In the fight scene between Benjamin and Tavington near the end of the movie, just as Benjamin is about to stab Tavington in the throat, the "blood" on his left sleeve appears to be green. In the next shot (as he turns away) it is a dark red. This was seen on a HD television broadcast.
Continuity mistake: In one scene where Benjamin rides up on the horse with the flag in the hand the flag changes. One shot it is old, the next is new. The white goes from dirty and then to clean.
Answer: I think the one you want is 'Unseen' - By Craig Armstrong which is track 2 on the Plunkett and Macleane soundtrack.