
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)

Other mistake: Christie starts killing people at the funeral, and those in attendance start running away. When it shows a couple hiding behind a car, the woman is corpsing at best, the man is flat-out laughing. (01:05:15)

Continuity mistake: When Billy inspects Christie's sword, he's holding it hilt up in the wide shot. In the close-up, he's holding it hilt down. (00:30:30)

Continuity mistake: When Ninja Christie kills the cop playing billiards, she finishes him off by slashing his face then throwing him onto a wall. The next shot shows that he somehow flies out of the window. (00:38:50)

Continuity mistake: This happens in the scene where the possessed Christie seduces then kills the cop in the hot tub. When 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)

Continuity mistake: When Ninja Christie fights a cop in a graveyard, the cop smashes a headstone with his baton. The damage on the headstone changes between shots. (01:06:25)

Continuity mistake: At the start of the film, Hanjuro intimidates a bodyguard by crushing a golf ball with his hand. In the initial shot, his palm faces outward. In the next shot, his palm faces inward. (00:03:55)

Continuity mistake: When Christie kicks a cop head-first into a gravestone shattering it (the gravestone, not the head, although one wonders how just the latter could happen), the stone breaks in two completely different ways in separate shots. (01:06:55)

Continuity mistake: In the sequence where Hanjuro crashes the helicopter, the pilot disappears and reappears at random. (00:09:15)
Suggested correction: Actually no; he's still there even in the camera angle the second screenshot is from; the knee of the policeman that is fighting Hanjuro covers his head, and then the seat makes it impossible to see him again. You may have to slo-mo to spot it, but he's visible at the beginning of the shot.