Continuity mistake: David Sloane (Sasha Mitchell) is the brother of Kurt and Eric Sloane (shown in Kickboxer, with Jean-Claude Van Damme). In the opening scene you can see pictures of the brothers, but the Kurt and Eric Sloane featured on the photos are NOT the Kurt and Eric Sloane from the Kickboxer movie. You also see pictures of Xian and Mylee, from 'Kickboxer'. Then later in the movie, when David and Xian 'meet', David asks Xian, "Who are you?" Well, he would obviously know, given that he's got Xian's photo hanging on his wall at home.
Continuity mistake: At one point in the movie you see David in hospital, with a nurse telling him something like, "You were very lucky" while taking off his band-aid. Miraculously he has no scar - nothing on his face. It's not even red. Talk about a quick recovery.
Revealing mistake: During the flashback when Sangha tells his goon what happened to Kurt Sloan after Tong Po battled him, a water machine is visible at the top of the screen spraying out a rain-like effect.
Revealing mistake: When David delivers the final kick to Sanga, he raises his left leg to kick but in the next frame it is his right leg which comes out and makes contact to Sanga's face. The right-leg is also a prop made of rubber as you can see the crews hand holding onto the thigh part and the rubber foot flopping/wobbling when contact is made. The following frame shows David bringing back his left leg after the right-legged kick.
Continuity mistake: During the Brian Vs. Tong-Po fight, Tong-Po lifts the referee onto his shoulders while wearing a pair of boxing gloves. Yet when you see the referee being thrown over the top rope and out of the ring, you see him being thrown by a bare pair of hands.