Continuity mistake: Tony Jaa is stabbed during the scene where he breaks 50 guys' bones. In the next scene which takes place, he fights 3 giants, and during that sequence, he takes off his shirt. Somehow, the stab wound has magically vanished.
Just after the long continuous fight scene in the restaurant, one girl pulls out a knife to attack Tony Jaa. The knife makes a sound like it's being pulled from a sheath but it's not touching any other metal.