American Ninja (1985)

Continuity mistake: Near the end of the film when the black star ninja and the yank ninja are fighting, they come to a wall with rope hanging down and start to climb.When the camera switches back and forth, you can see that they have both chosen the same rope (they both climb on the rope marked "Gin") even though they are side by side when they climb.

Shinyuki: These symbols will give your mind ultimate purpose. Gin, Retsu, Zai, Zen.
Joe: Kobudera.
Shinyuki: The Kobudera. Ninja magic. Ninjitsu-to, the ability to seem invisible to cause fear and paralisis in your enemies.