Continuity: When Braden sets out to kill Caifano's brother, he wears a business suit and carries a small bag as he enters the restrooms. But when he confronts his victim, he carries a ninja-to (ninja sword) in his sash. The sword is definetly too long to fit in the bag or under the suit, and I've never heard of dismantable combat swords.

Factual error: Star shuriken, despite common misconception, are not inherently deadly weapons. They were mostly used for distraction, since their lack of a single weighted point makes their attack rather inefficient (although the weapon could be coated with poison). Although it is possible to hit an eye, it is very difficult to hit such a small target or scoring a sufficiently deep wound to penetrate to the brain with a star shuriken.

Deliberate "mistake": When Braden confronts Cho on the rooftop, he uses dummies of himself to throw his opponent off-balance. But how could he have brought the bulky dummies onto the roof without being in the first place, or without proper preparation?

Continuity: Just before Cho kills Braden in the final fight, they use ninja-to (swords), but then suddenly the scene jumps to the swords lying on the ground and Braden using a dagger, which Cho drives into its wielder's belly.

Continuity: The Masked Ninja (Braden) carries a lot of weapons which keep appearing and disappearing whilst he inflitrates Chifano's building; his spear-stick and a throwing axe (both relatively big - and therefore visible - weapons), for example, are both there whenever he needs them.

Plot hole: To murder Chifano's informant, Braden uses a throwing star. But there is one thing which makes this scene illogical: Braden is evidently not in his civilian suit, but in his ninja costume (the ninja suit's armsleeve is definetly on his arm). But since Chifano and the informant are looking in the same direction when the throwing star hits, and since a ninja costume would make Braden stick out like a sore thumb, it is VERY impropable that he'd escape the scene just like that.