In the fight with the guys in the yellow hummer, he is thrown in front of a Silver car, and it looks as if he narrowly makes it out of the way. But when we see what is recorded on the camera, the car comes nowhere near him and he's already running back towards the other guys while the car is veering long before it would have even reached him
When Jake goes to the gym after sticking up for Baja in the parking lot, he throws a kick to Roqua's head while he trains him, in which Roqua has to duck. Later in the movie, when he's training, it shows that he cannot kick that high.
The first time Jake ever goes to Roqua's gym, he spars with Miles. He throws a punch early in the match, and you can hear the breath he takes when throwing the punch. The next day, Jake learns that you should breathe out when you punch.
After Jake does the final kick to Ryan, when he turns to see Baja (camera on Baja), his face appears flawless (no cuts, no scratches). Then when the camera turns back to Jake, his face has cuts, scratches.
During Jake's fight with the guys from the Hummer, he throws one of them into the vehicle's side-view mirror. In the first shot, it is seen to be the passenger side mirror. In the next shot, it is obviously the driver side mirror, and then in the last shot, it goes back to the passenger side.
During Charlie's tennis match we see him lose a point and the announcer calls Deuce. The next point passes and the announcer calls 40-30. You then hear deuce called again moments later. We then see Charlie win a point and the announcer once again calls deuce. It is then announced on the next point that Charlie wins the game without advantage ever being called.
During the Beatdown, when Jake is facing Dak-Ho, right as Ho delivers a hard back kick in response to Jake's right cross, the camera clearly shows Dak-Ho's right foot kicking Jake's ribs. But, when the camera zooms out, it shows Dak-Ho just used his left foot for that last kick.
When Jake arrives at Sean's gym on the first morning, there is daylight present. This would be at 5AM, since Sean told him to be there at 6AM and he shows up an hour early according to what Sean says. This is never possible for Orlando, Fl.
During the fight scene when Jake gets out of the car to fight the three guys in the Yellow Hummer, Max lifts up his video camera after Jake throws his first punch, but after the fight, when all of the students are watching the fight on the net at school, it shows that Max is recording before the fight even begins.