Revealing mistake: When Chris and Jackie are singing the Beach Boys song in the car, look at the steering wheel. When Chris Tucker begins to dance for a brief moment you can see that there is no key in the ignition. (00:02:30)
Revealing mistake: When Inspector Lee was running through the casino, his hands are bound together with tape. When he tumbles across a gambling table, his hands come apart. When he completes the tumble, he quickly puts his hands together again. (01:09:00 - 01:10:15)
Revealing mistake: When Lee and Carter are left hanging on the Chinese bamboo, Lee says, "It's very strong." Look closely at Carter's left arm, there is a safety wire running from the bamboo, down Carter's sleeve.
Answer: Although it's never shown, it was probably Ricky Tan's henchmen. Lee and Carter were outnumbered and decided to give up. After the fight, they were dropped off in the middle of a busy highway with no clothes on as a way to add insult to injury.