Visible crew/equipment: In the opening credits sequence, where Chosen One is driving a car and Master Tang as the narrator says "And sometimes he drove," you can see the faint reflection of the camera car filming. It's best to see on the tail of the car and just below the silver bar you can see the wheels of the camera car. (00:07:10)
Revealing mistake: When Chosen One is training and Wimp Lo comes up to him and says: "Knock, Knock. Who's there?" You can see that he is transparent because the scenery is visible through him, this is easily seen in his black hair. It is also apparent when he says, "Take a close look 'coz I rule baby". But by the next shot he isn't transparent anymore. (00:20:00)
Continuity mistake: When Betty receives the letter from the evil council, look at his jacket. It has long sleeves, but when he stomps the letter to the table, the sleeves disappear.