There was an additional fight for Kham in the temple, against two Taekwondo fighters played by Daniel O'Neill and Dean Alexandrou. The scene was cut in order to streamline the last act, becoming a Missing Trailer Scene, but their unconscious bodies can still be seen in later footage.
In yet another Missing Trailer Scene, a duel against Johnny and his men in Sydney was also cut. The warehouse fight was also apparently even longer before the director decided to trim it.
The American release was cut down by a whooping 25 minutes of footage, although it contains a special scene (Kham beginning his ambush on the criminal group) that was deleted from all other releases, including the Thai one.
Jaa, being a skilled Muay Thai practitioner, decided to create an entirely new style nicknamed "Muay Kodchasaan" in order to make his character more unique.
A Thai camera operator volunteered to work out specifically to have the strength and stamina to wield a SteadiCam rig while keeping up with frenetic action of the film's Oner. A western camera operator had originally been brought in because there wasn't a Thai operator large and strong enough to effectively carry a SteadiCam rig, but he couldn't keep up with the oner's pace.
On-Set Injury: Lateef Crowder injured his Achilles tendon during filming, which resulted in the fight scene between his unnamed capoeirista character and Kham being truncated into the much shorter (but still frenetic) Battle Amongst the Flames that's seen in the final cut.
The Bodyguard (Thai) have Tony Jaa's cameo in the second movie, where he's a jade elephant vendor looking for his elephant. There's even a fun Actor Allusion where he shouts "Where's my elephant?" like his Tom-Yum-Goong character.
Troubled Production: The film took two whole years to complete for how ambitious it was. The famous oner fight, for instance, required five full takes over a month to nail it, as objects would not break or would not be correctly placed due to the scene's difficulty.
What Could Have Been: The Jackie Chan impersonator Kham meets in the airport was meant to be a homage to his films, which Jaa is a fan of, but according to longstanding rumors that have yet to be dispelled, it would have been played by the real Chan had he been available for a cameo.
Sequel
Star-Making Role: While Marrese Crump had received his first exposition bit in Wrong Side of Town, he got to shine here as No.2, and is mainly known for this role to date.
