Revealing mistake: At the beginning, when Ivan and the two New York businessmen approach the school, the three are seen through a window from inside the school. If you pay close attention to the reflection of the students in the window, you can see that they are in no way doing anything related to what is being heard inside the school. After the class is dismissed and starts to leave, we see Ivan and the two businessmen begin to enter the school, and if you look in the window, the class is still going hard. (00:03:00)
Revealing mistake: When Jason is doing a two fingered push-up on the table in the park, a wire can be seen on his back lifting him up. The mistake has been fixed with proper framing in recent home video versions.
Revealing mistake: When Jason does his backflipping move that wins him the match...you can actually see it's Corey Yuen dressed as him that does it. (01:35:25)
Revealing mistake: During the final fight, Ivan the Russian forgets completely how to fight and never, ever pulls guard. Look no further than the moment when right at the beginning Jason charges at him; Van Damme blatantly drops the arms on purpose to be hit. (01:32:30)
Revealing mistake: Ivan goes berserk and kicks the referee out of the ring; you can see the actor bounce up. Apparently in some prints of the movie it is possible to even see a mat - not in the Region 2 DVD. (01:31:40)
Revealing mistake: The TV commentators for the final fight sit at their table with bleachers in the background, but the other shots of the 'arena' show it's nothing more than a gym with everyone sitting at the same level. (01:16:20)
Revealing mistake: RJ does some breakdance routine before inviting everyone on the dancefloor. As he does the final kip-up, the white dude in blackface who bodydoubles him nearly loses his wig. (01:11:40)
Revealing mistake: Jason charges in to save his dad from the beating. He breezes past the three goons and the last to charge him is the drunk dude that caused the whole commotion. In the middle shot that follows it's blatant that the exchange starts with the guy on his feet, standing, and not running at Jason, and there are visible pauses between the punches where he is waiting to be counterpunched. Completely open and still. (01:08:50)
Revealing mistake: When RJ skates by the construction site, the actual skater is quite obviously a taller stuntman in a wig. (00:17:00)
