Other mistake: When Chris Tucker and Jackie Chan are fighting in the massage parlour, Chris Tucker is able to fight and do all sorts of moves with only a towel wrapped around his waist that magically never falls off. (00:18:30 - 00:20:20)
Other mistake: When Carter and Lee walk through the Crenshaw 'restaurant', the Chinese woman who yells at them speaks very, very bad Chinese - the first half is incomprehensible and the last half is mostly mispronounced.
Other mistake: When Carter and Lee go into the nightclub and talk to the hostess, watch closely, you'll see Lee walk into Carter's shoulder momentarily and then pull his head back quickly, before walking off.
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.