Lee Butters: You have the right to remain silent. So shut the fuck up. You have the right to an attorney. If you can't afford an attorney, we will provide you with the dumbest fucking lawyer on Earth. If you hire Johnny Cochrane, I'll kill you!
During the big gun battle right before the last fight scene, Riggs is shown driving a forklift, and knocking over some barrels on top of Wah Sing Ku, leader of the Triads. When the forklift does the 180° turn, you can CLEARLY see that it is not Mel Gibson, but an Asian stunt man.
After Riggs shoots the valve on the napalm tank being worn by the criminal with the flamethrower at the start of the film, the legendary "Wilhelm" Scream can be heard as the criminal goes flying.