Other mistake: Throughout the dance club sequence, Kelly in several shots, from the very opening when she is in the background, up until everyone gets on the dancefloor, can be spotted with a guy standing next to her in a shirt similar to the protagonist's. But she has no date for and she came with a couple of girlfriends. (01:10:00)
Other mistake: Jason's dad is still limping heavily and barely makes it to the pool table to bring the beer. 20 seconds later he's dragging an angry and non-cooperative guy bigger than he is all across the beer joint, and even tosses him out of the door as he lands with a nice graceful flip like of course any drunk dudes would. (01:03:15)
Other mistake: In the shot with the Stillwaters' car pulling in front of their new home in Seattle, on top of the luggage rack you can spot a little red item that falls off as the car stops. Coincidence or not, a minute later Jason opens the U-haul cart and grabs a box with a red cup on top. Same object or not, surely they did not travel from LA to Seattle with something precariously on top of a bag. (00:08:40 - 00:09:30)
Other mistake: As the trio of bad guys enter the dojo to challenge Jason's dad, they go past a few students, who apparently prefer getting out in the street in their karate gi and bare feet rather than take a minute to at least put their shoes on - we even see one with sneakers and belt in hand, makes you wonder if he's just gonna drop his pants in downtown L.A. That one is not the door for the locker rooms. (00:03:30)
Other mistake: Van Damme in the opening credits is presented quite literally as "Ivan, the Russian." During the movie they call him Ivan and is last name in the tournament is mentioned by the announcer as "Krasinki." So naturally in the end credits roll Van Damme is billed as... Karl Brezdin. Close.