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.
In most foreign releases of the film, references to Madame Rose being a kathoey (male-to-female transsexual) have been removed, in spite of the fact that the actress playing her (Jing Xing) is also a transsexual. Her survival at the end of the movie has also been cut, instead indicating that she is killed.
Three cameos: Tony Jaa's father appears at the Songkran scene; a Jackie Chan double in the airport, intended as a tribute to Jaa's idol; and Thai rock star Sek Loso appears prominently in the foreground in one scene drinking his trademark energy drink, which was tied up in a promotional relationship with the movie in Thailand.