Continuity mistake: When Rafer Jason Madison III asks Jason if they just moved in, eliciting a humorous response, he has two hands on the same (left) handle, switching to both hands at the cut. (00:11:10)
Continuity mistake: When RJ stops his boombox in front of Jason, the fact that the two shots were filmed in separate moments is obvious; they are now at greater distance and RJ does not cast his shadow on Bruce Lee anymore. (00:10:55)
Continuity mistake: Jason drops the basketball he was carrying. There's a mat on the door of the trailer; when Jason picks up the ball the new kid bounced back to him, the mat is folded differently. (00:10:35)
Continuity mistake: Jason grabs from the cart a Canada Dry box with a basketball and some blue plastic stuff on top, and brings it to the garage. He then goes back to the cart, and meets his future best buddy R.J. Madison as he...grabs from the cart a box with a basketball and some blue plastic stuff on top. (00:09:35 - 00:10:30)
Continuity mistake: Setting up the garage, Jason picks from his box a punching ball. Notice the sticks on the right side of the box. And how when he Tarzans into the shelves a moment later the sticks have changed position. (00:10:00)
Continuity mistake: Jason wants to see the garage right away, knowing he's gonna set up some cool stuff there. He brings his basketball in front of the garage door. Between that shot and the one where he opens it, the natural light has completely changed; the house is not casting a large shadow behind him, the tree is, and his own shadow moved to the opposite side. (00:09:50)
Continuity mistake: Van Damme sprints when his buddy is forced to kneel before Stillwell; the problem with the cool sequence when he springboards off his back is that Stillwell in the shot when Goatee Guy went down had already regained his balance, while in this new action shot his leg is still raised. (00:05:30)
Continuity mistake: Sensei Tom Stillwell realises the threat from the bad guys being all evil in his dojo and jumps back yelling "This will solve nothin'." Before it cuts to a new view, he is looking away from the guy in a suit and looking at the others, but in the next shot he's still looking at the guy and only then checks Van Damme and the bearded dude out. (00:04:40)
Continuity mistake: At the beginning of the movie, Tom Stillwell is shouting instructions at the class. He calls for a stop with his hands behind his back, and the class turns and stands by as he looks...with his hands on his hips. In the reverse shot his arms are down. (00:01:50)
Continuity mistake: When Jason and RJ are putting the wood horse on the floor and drinking the coke Jason's legs change position between shots.
Continuity mistake: After Kelly's party Jason gets to his home and his dad yells him about fighting then gets to the garage and drops just some magazines and rips out the Bruce lee's poster but in the open view you can see several things on the floor.
Continuity mistake: When Scott is using the hose he is sitting on a chair with his house in the background. In the next shot the house is gone and there are some trees. The his dad yells at him and the house is back again.
Suggested correction: You probably hadn't a chance to rewatch carefully. The camera angle changed more or less from Dad's perspective a bit raised, and so you don't see the house but the lawn. All the green in those shots is not trees but rather the lawn, with the same shadows (more or less, the light does not quite match but it's very minor) you see previously.
