When fighting the "woman" in his friend's club, she reveals that "she" in fact a "he", but in a few shots that follow the revelation it is obviously either a woman or a man still wearing the padded breasts to appear female (this is very obvious when she grabs for the whip).
When the two armed gunmen are coming up the stairs in the first scene to kill Steven Seagal, in one shot they are both carrying pistols. In the next, one clearly has a submachine gun which he wasn't carrying earlier.
At many points in the movie Steven Seagal and others fire unrealistic numbers of shots from their weapons without reloading. One of the most obvious of these is when he fires 10 shots from his trademark weapon, the Colt M1911, which holds 7.
The Thai have as strong touch-taboo - that's why they use the "wai" as a greeting instead of shaking hands or similar. Our Hero would know this, expert as he is in matters Thai, so he would not have touched the monk's hands after speaking with him.
The empty bullet casings dropped from a Humvee-mounted machine gun are the ones from blanks , not the ones from real cartridges. With a normal cartridge the casings would end with a large hole where the bullet was.