Plot hole: When Ching and Jen Moo are confronted by the God Skills Society at the Sun Family Temple, there are three disciples appearing behind the master. But only two of then (the long-haired man, and then the monk) are seen entering the fight; the third one suddenly appears as a yellow-clad corpse at the entrance stairs as Ching fights the long-haired man.
Ninja In The Dragon's Den (1982)
1 plot hole
Directed by: Corey Yuen
Starring: Hiroyuki Sanada, Jeong-lee Hwang, Conan Lee, Po Tai
Revealing mistake: Jen Moo cuts off the God Skills monk's ear, but as Ching picks it up, it strangely shows no opening for the ear canal.
Trivia: The 'torpedo-digging' trick Jen Moo uses in the final fight is a standard trick of all Hong Kong ninja movies made in the 80's.