Revealing mistake: During the final fight, Takeda is chained up between two ninja, and Kinjo orders them to kill him. One of them raises his sword, but is shot by Takedas wife. As the arrow hits, the film noticably "jumps", as the actor is replaced by another with an arrow attached to his throat. Not only does his position (especially his head) slightly change in an instant, but his suit also suddenly becomes a lot darker, and a crease appears in his hood.
Revealing mistake: When Kinjo is fighting Saito, he throws away his sword and fights Saito with his bare hands. During the duel, he first slams Saitos arm over his knee, then elbows him in the side of the head. But look at Saito's head; he reacts to the elbow LONG before it connects.