Continuity mistake: When Mr. Big comes up to the cabin to talk to Carrie, he isn't wearing glasses. After he drinks too much wine, they decide he has to stay the night at the cabin. Aiden throws him a pillow and blanket. Right when the blanket hits Mr. Big as he is sitting in the chair, you can suddenly see what look like some sort of metal frame glasses hanging vertically/falling off from Mr. Big's face, as if they were knocked off by the blanket. Where did the glasses come from? He wasn't wearing them just before that. (00:24:40)
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. (00:09:25 - 00:10:35)
The post-it always sticks twice - S6-E7
Continuity mistake: Samantha produces a joint outside the club and the way she holds it differs between the front and back shots.
Running with scissors - S3-E11
Continuity mistake: When Carrie and Mr. Big are having their affair in the 3rd hotel; it is located on 56th & 8th, and is described as being a 'seedy location'. When you see the inside of the hotel room, it is obviously a very cheap, tacky hotel. But later in the episode when Carrie and Mr. Big are in the lobby of this same hotel on 56th & 8th (verified in voice over); it is obviously the lobby of a much nicer, elegant, more expensive hotel. (00:02:05 - 00:19:30)
Continuity mistake: When Carrie and Aiden are arguing out on the street in front of her apartment, there is a shot of her holding the leash for Pete the dog in both hands. But suddenly as she is yelling at Aiden, you can see her throw both her hands up in the air and touch her head. She is not holding the leash at all. Then seconds later; there is a shot of her legs as Pete is running off, dragging the leash from her body and waist as if she is still holding it. (00:24:30)