Contains one of the longest no-cut fight scenes in movie history: the fight up floor after floor lasted four-plus minutes.
According to the director on the special edition DVD, the continuous fight scene took five full takes for a variety of reasons, including stunt objects not breaking and the stunt mat not being in place in time. The five takes were filmed over a one-month period.
Tony Jaa has developed a new style of Muay Thai specially for the film: "Muay Kotchasan" is based on elephants' movements ("throw, stamp on, grab, break").
The part where he jump kicks and breaks the lamp on the lamppost making the bad guy run in fear is an homage to the Bruce Lee film The Way of the Dragon (1972), where he does the same thing to a ceiling light after taking down some bad guys, causing the last of to run away in fear.