Continuity mistake: When Braden is confronted by Cho's mother, she throws a blade at him, which he catches and throws back, sticking it in her shoulder. She uses a blowgun and there are two shots of her with the blade in her shoulder and blood on her clothes from the wound. However, when she misses there is a shot of her using a smoke ball where there is nothing in her shoulder, nor is there any blood on her clothes.
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.
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.
Continuity mistake: 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.
Visible crew/equipment: When Cathy is being slowly drowned in the hot tub there is a shot were we see Braden's tattooed henchman playing around with his nunchucks and just above his head you can see a clear shadow of the boom mic dip into the shot and is then quickly pulled away again. (01:09:19)
Visible crew/equipment: When Cho is fighting the thieves in the street one of them tries to smash a barrel over his head but Cho knocks him out and the man drops the barrel as he collapses. If you watch as the barrel drops you can see the shadow of the camera cast on it. It's too narrow to be anything else in the scene. (00:39:02)
Continuity mistake: When Braden gets out of his car in front of Caifano's building there is a close up shot of three doormen, the two on the left are stood very close together and one on the right is further away. Then cut to another angle and all three doormen are spaced differently. (00:19:47)
Continuity mistake: When Cho is fighting the three thieves (who have stolen his dolls) outside his showroom there is a moment when the bad guy wearing all denim is knocked down against a staircase, Cho then moves to grab another bad guy as he attempts to flee up a separate staircase and in this shot the denim guy has vanished from the scene. (00:35:45)