During the fight in the cave, just after Ting sees that George is being pulled up by a rope around his neck, two men attack Ting from the front and back. Ting kicks the man to his front in the head, jumping out of the way of the rear attack in the process; however, in the next shot the man behind him is down unconscious despite not having been hit.
At the end, in the cave, when Humlae is trapped, and Muay is attempting to free him, then shakes him, you can see his entire body is actually free and they could have pulled him out. The stuff on top of him is loose as well and shakes with him.
When Tony Jaa executes one kick to knock out his first tournament fighter, he is clearly in a left fighting stance; yet, without changing his stance, he kicks from a right fighting stance.
When Mad Dog is throwing plates at Ting, there is a bystander in the corner near Ting. He disappears and reappears between shots.
Ting's pants have a rip near the calf area that appears and disappears between shots in the battle in front of the big Buddha head near the end of the movie.
In the end fight between Ting and Saming, the less athletic Saming is obviously doubled by a guy with a different posture and hair style.
Obvious stunt double when Don throws Humlae against a gas pump - Humlae's stunt double has a smaller head and more hair.
When Humlae and Ting venture into the Cave riding a motorcycle, the stand of the motorcycle is still down.
Obvious (shorter) stunt double when Mad Dog is thrown through the window.
Obvious stunt double when Humlae jumps through the wooden window to attack Don, and when Don throws him over the gas pump. Humlae's stunt double has a smaller head and more straight hair. Stunt double is used in both scenes.
There is one spot in the film where Ting, Humlae and Muay are eating on a street corner. Before this scene changes, it always freezes for a second, no matter what copy of the film you have or what DVD player you are watching it on.
Guy on the motorcycle shoots at Ting, but the first shot is inaudible, and then we hear it when it makes a hole.
In the tracking shot of Ting being chased, just after he leaps over the children, the sound recordist can be seen holding his microphone and moving with the gang members on the right side of the frame.
In the cave near the end of the film, Saming is no longer using the electronic voice box that he had to use to speak with throughout the rest of the movie