Continuity mistake: Stanford is given a drink and raises his glass towards his mouth. A shot later it's at chest level. (00:08:52)
Continuity mistake: Jarred shows up at the bar and puts his left arm akimbo. A shot later it's lowered.
Visible crew/equipment: When Sam is with the realtor woman, the boom mic is reflected on her sunglasses.
Continuity mistake: After seeing Skipper during dinner, Carrie says "you broke up with him" and Miranda tilts her glass to the right. From the opposite angle it's straight.
Continuity mistake: While talking to Stanford at the bar, Carrie's right arm is bent over the counter, but half a second later it's raised and holding a straw.
Continuity mistake: Stanford's shirt collar is wrinkled and pointing out or ironed and tucked under the jersey, depending on the soht.
Continuity mistake: Stanford takes a cocktail to his lips when Jarred shows up. Then suddenly Stanford's glass disappears in the angle shot from the side.
Answer: After its initial run on HBO, SATC was syndicated for cable TV. Syndicated series are usually edited for nudity, language, running time, and use alternate filmed scenes, etc. Maybe you saw two different versions where an alternate narration was used.
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