Continuity mistake: When the policeman throws the billiard balls at Ninja Christie, the balls have a different position on the table depending on the camera angle and the pool cue appears and disappears from the table. (00:38:30)
Continuity mistake: Ninja Christie kills the cop playing billiards by slashing his face then throwing him onto a wall. The next shot shows that he instead flies out of the window. (00:38:50)
Other mistake: When the ninja slices at point-blank the obese cop in the pool room, the make-up used is a single strip of blood. Obviously they wouldn't show a graphic dismemberment or decapitation, but the man here practically dies from a cut on the cheek. Men do more harm to themselves shaving. (00:38:50)
Continuity mistake: In the scene at the spa, notice how Christie lets nonchalantly go the towels she used as an excuse to get in the room with the ladies and the sleazy cop Jimenez. She does the deed killing everyone, then as she walks away look at the towels and their much neater placement on the bench. (00:43:05 - 00:44:35)
Continuity mistake: At the spa, Christie opens her robe. The darker haired lady-friend of the sleazy cop turns towards her noticing what she'd doing, but the following reaction shot begins with her still engaged in conversation; she notices the competition only a moment later. (00:43:10)
Continuity mistake: Christie is making out with the sleazy cop. We get a close-up of the poisoned ring and how she turned it, and she is ready to strike. She has both arms over his shoulders, both for the close-up of the fatal gesture, the arm is out of the way. (00:44:00)
Continuity mistake: When the possessed Christie seduces then kills the cop in the hot tub, he pulls away from her embrace after he realises that she's poisoned him; he's holding onto her with both hands. In the next shot, he's holding her with just one hand. (00:44:10)
Audio problem: When Christie moves on to the second girl in the hot tub to strangle her, she screams "N-noooo!" but her lips and facial muscles don't move. (00:44:20)
Other mistake: This is just baffling; in the scene where Christie is wearing a rather sweat-stained pink top and Billy turns the music off asking her "Where have you been?" they are the only ones in the room, but someone out of frame throws what appears to be a puppet on Christie bed (!?). (00:45:45)
Continuity mistake: When Billy pays the wise man from the Orient, the wad of bills does a 180° between shots. (00:47:45)
Continuity mistake: Once Christie is all tied up, the ceremony begins. Miyashima is holding a pipe that faces opposite ways between shots when he holds it with both hands. Still holding it with both hands he brings it to her lips, then in close-up suddenly he holds it with just one hand. (00:49:20)
Continuity mistake: The priest is praying and unknowingly almost exorcises the evil ninja, he is holding his onusa (the stick thingy) with one hand or both hands, and when they both speak Japanese the grip of the left hand differs between angles. (00:50:00)
Continuity mistake: When the priest tries to read from a scroll and gets laughed off by the ninja demon, he is holding the scroll in a different way between shots - just use the little string as reference. (00:51:10)
Revealing mistake: At the climax of the exorcism scene, Christie begins spinning at great speed. That's an impressive supernatural feat already, but the real scary part is that to do, so she also transmorphs into a dummy. (00:52:40)
Revealing mistake: The first time we see the legendary Sho Kosugi properly in action, he knocks out a guard, then he throws a shuriken at another and fights him. He dodges his baton, kicks him, and then you can see clear as day the awkward moment when the stuntman just stops and waits for the follow-up push-kick towards the dumpster. (00:55:20)
Revealing mistake: Somehow, every ninja in this movie is really bad at being undetected. Sho Kosugi gets caught again by a guard after fighting with the ones outside the morgue, and disposes of him with a roundhouse kick. The stunt is comically bad, because you can see the guard literally throw himself at the wall headbutting it. (00:55:50)
Continuity mistake: When Yamada knocks out the group of three guards he failed to sneak past at the morgue, the guard to the left goes down dropping the nightstick at distance and at a certain angle. Yamada walks past them and the baton is closer and at a different angle. (00:55:55)
Continuity mistake: When Yamada stops the hearse, the shadow of the vehicle doubles in size between shots. (00:57:10)
Continuity mistake: When Christie's wardrobe tries to suck her in, the items that are being drawn in and therefore slide on he floor, change between shots with no logic. For instance, we see an empty metal vase, then the same vase with marbles, then just the marbles. (01:02:00)
Continuity mistake: At the funeral, Ninja Christie shoots one arrow, then a second. The officer dies holding one hand to his chest in the shot, both in the next. (01:05:05)
