Continuity mistake: Miranda arrives home and starts opening an envelope. From the opposite angle it is already open and she is already holding the letter.
Four women and a funeral - S2-E5
Continuity mistake: While in the car after the funeral, Sam's coat is either covering all of her elbow, or leaving a bit uncovered, or a big part uncovered, depending on the shot.
Continuity mistake: When Anthony appears, a piece of rectangular confetti suddenly appears out of nowhere on Charlotte's hair in a mere half a second.
Coulda, woulda, shoulda - S4-E11
Continuity mistake: Lucy Liu takes the cup to her mouth but in the angle shot from the side it disappears.
The agony and the 'ex'tasy - S4-E1
Continuity mistake: Inside Big's car, Carrie lowers her cup, but a shot later it's raised.
Continuity mistake: When Charlotte is kicked out of bed by the couple a beige silk cushion flies off bed. Shot changes and the cushion disappears, only to reappear flying seconds later.
Continuity mistake: When Carrie confesses Charlotte that she is calling Aidan, the dancers moving and waving their arms wildly behind Charlotte disappear between shots. One might argue that it's because of the angle of the shot, but they're all moving around all the time and at least their arms should be visible.
Continuity mistake: After Charlotte twirls her drink swaps hands between shots.
Twenty-something girls vs. thirty-something women - S2-E17
Continuity mistake: At the party, when the doctor leaves, Laurel holds the drink with her left hand but a shot later it's on her right hand.
I heart ny - S4-E18
Continuity mistake: When Miranda decides to name the baby Brady her hair swaps from dry and brushed to sweaty and messy.
Continuity mistake: In the shower, Aidan's slick hair swaps to messed up in a split second. Water couldn't have done it and neither could he, for his hands were busy soaping his body.
Continuity mistake: When Carrie tells Aidan to stop hammering the wall he has dust on his T-shirt, which magically disappears in subsequent shots. After Carrie confesses, dust reappears.
Revealing mistake: When breakfast is served, Samantha mimics eating and chewing, but her fork is very obviously empty.
The agony and the 'ex'tasy - S4-E1
Continuity mistake: When Carrie holds the "Dear single" letter, the envelope is below the paper, but in the close-up it's behind the upper part of the letter.
What's sex got to do with it? - S4-E4
Continuity mistake: When Charlotte is showering, a bunch of foam on her forehead appears and disappears and reappears again randomly depending on the shot.
Continuity mistake: When Miranda talks about her date licking her butt, the food on her fork disappears between shots.
Continuity mistake: While having breakfast, Sam's fork suddenly disappears between shots.
Continuity mistake: When Charlotte asks if Tray is her boyfriend or lover, Miranda's fork is lying on the plate or held in his hand, depending on the angle.
The real me - S4-E2
Continuity mistake: When Miranda eats her salad, the fork swaps hands between shots.
Continuity mistake: At the ball, Richard takes a sip with his right hand, but from a different angle it's his left.
Answer: I'm a long-time fan of the show, having re-watched it many times, and I definitely remember slightly different dialogue at the end of that episode than what's on my DVD. I'm afraid I have no idea why this change might have been made or any other info, but you're not insane.
Purple_Girl