Continuity mistake: When Samantha first puts on the gold necklace in the hotel room, the pendants dangling on the right side are lying over the right lapel of her blouse. But after Samantha walks the housekeeper out the door and turns to face Richard, suddenly the same pendants on the necklace are underneath the lapel, though she did not have a chance to fix the necklace in this time.
Continuity mistake: When Carrie and Miranda are getting on the bus to Atlantic City, an older lady dressed in pink is sitting down right behind them. As the scene continues, we can see many more people filing onto the bus as the girls talk. But in the next shot of the entire bus, suddenly there is no one at all behind Carrie and Miranda. Not even the lady in pink; the entire bus behind them is empty, although people are still getting on.