First of all, the film has the longest no-cut, steady cam fight scene in movie history. It follows Kham (played by Tony Jaa) up a spiral staircase, fighting different thugs to get his elephant back. The only supposedly use of CGI is during the take where a glass window is shattering. The scene is 4 plus minutes long, and only one camera was used:
Jaa also did all the stunts himself and used no wires throughout the film, which is no surprise since Jackie Chan is his idol. You can see a Jackie Chan stunt double in the airport scene, which was a tribute to him.
The film did well in the U.S, being the most successful Thai film with a total worldwide box office gross of $25,175,096.