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.
Plot hole: After leaving the hospital, Racine ducks into a pachinko parlor. In there, he gets a young girl to help him find a telephone and a taxi. The problem is, she is about 10 years old, and you have to be 18 to even enter a pachinko hall. The attendants we can see in charge would have evicted her within minutes.
Continuity mistake: After Racine is wheeled out of the hotel on a stretcher, the uniformed police officers hand their inspector an evidence bag with the weapon used on Racine, a throwing star coated in poison. The inspector looks at it, then returns it with orders to take it to the laboratory to determine the poison. However, when we see Racine on the operating table, the star is shown, lying in a puddle of blood on the operating table, as if the doctors just now had pulled it out of him.