This was the first film of a five picture deal for Lucinda Dickey who Menahem Golan wanted to make her a star very badly. The other films in the deal included Breakin' (1984), Breakin' 2: Electric Boogaloo (1984), Breakin' 3, which was planned but fell apart, King Solomon's Mines and its sequel, Allan Quartermain And The Lost City of Gold. The latter three films didn't happen for her because she felt that both she and Cannon Films were totally tired of each other at that point.
Shô Kosugi is an actual Ninpo practitioner and was also the movie's technical advisor and fight co-choreographer. Kosugi starred in numerous other 1980s ninja movies and appeared in each of the films in Golan-Globus' Cannon "Ninja" series but playing different characters.
The arcade machine in Christie's apartment is a prototype of the game "Bouncer" by Entertainment Sciences. Due to financial difficulties the game was never widely released.
The eye patch Yamada wears is a Tsuba, a hand guard for a katana