After Lori/Red Ninja is stabbed by John, the katana on her torso disappears and reappears between shots.
During the Val Verde assault scene, John's hair length changes between cuts.
Some of the $100 bills in Colonel Kinsky's briefcase are folded up, revealing blank sheets of paper underneath them.
Jenny's room has a poster of the film Bloodsport, which was not released until 1988.
Lori plays her workout video on a mid-1990s model Samsung VCR.
Jenny is playing Operation Wolf on the NES, which was not available on the console until 1989. Furthermore, the game featured in the film is the 1987 arcade version.
Jenny's toys in her room include Teenage Mutant Ninja Turtles toys, which were not introduced until 1988.
Kowalsky and the Red Ninja use the Power Glove, which was not introduced until 1989.