Revenge of the Ninja (1983)

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.

Continuity mistake: 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.

Trivia: It is commonplace for Sho Kosugi films that whenever a family is to be portrayed; his two sons Shane and Kane are cast into corresponding roles.

Chifano: Braden, you're dealing with me now. As far as you're concerned, that stuff is already paid for. It's mine. So don't try any funny stuff.
Braden: Don't fuck with the Japanese, Chifano. They can be very dangerous.
Chifano: I'll fuck with whoever I want. I don't need you. I'll make my own deals.
Braden: If you're thinking about going behind my back Chifano, you'll be making a big mistake. A very big mistake. You don't even know me yet.

Lieutenant Dire: You talk to me, you son of a bitch. Now somebody's muscling in and I want to know who the fuck it is.
Chifano: That's my bag of apples.
Lieutenant Dire: And mine.
Chifano: Bullshit! You guys celebrate downtown every time one of us gets the clap. What the fuck do you want from me, Dire?
Lieutenant Dire: I want a name. I want addresses. I've got nothing.
Chifano: Then you've got what I've got. shit.

Cho Osaki: Only a ninja can stop a ninja.