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.
Continuity mistake: While making a hole on the wall, Aidan has the sledge hammer resting on his shoulder, but from a different angle his arm is resting by his side.
Continuity mistake: While wearing the wedding dress, Carrie says she can't breathe and raises both arms close to her neck, but a shot later only one arm is raised.
Continuity mistake: After Carrie and Miranda dress the same and exit the fitting room, Carrie holds Miranda's hand. A shot later Carrie is away, hand loose and she is holding it again.
Continuity mistake: When Carrie and Miranda arrive at the wedding dress store two Caucasian women stand on the right, behind them. Then they are suddenly on the left. Half a second later, two Afro-American women have taken their place.
Continuity mistake: When Carrie and Miranda go the buy the wedding dress, the clerk's hands are either on top of a book or next to its edge, depending on the shot.
Continuity mistake: After the sonogram, while Carrie and Miranda walk, bystanders stare at the filming, check the old lady with a pink T-shirt on the right, bending her neck, and the woman with a cell phone on the left.
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.
I heart ny - S4-E18
Continuity mistake: When Sam and Carrie walk down the street, a woman in white and a man with a brown shirt pass them by twice.
I heart ny - S4-E18
Continuity mistake: Carrie says "He's not Niagara falls" and Miranda takes the fork to her mouth. A shot later it disappears. (00:09:51)
I heart ny - S4-E18
Continuity mistake: During breakfast, after Charlotte says "you had sex with Steve" Miranda's fork disappears from her hand.
Continuity mistake: Magda holds the sonogram from the lower left corner, but a shot later she is holding the upper left one.
Continuity mistake: Miranda folds and puts down the legal papers, but a shot later she is still holding them in her hands.
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: At the ball, Richard takes a sip with his right hand, but from a different angle it's his left.
I heart ny - S4-E18
Continuity mistake: Carrie tells Big he's "the Chrysler building" and extends her arms. A shot later they are lowered.
Continuity mistake: During brunch, when Miranda asks "an unpleasant question" a fork suddenly appears in her hand.
I heart ny - S4-E18
Continuity mistake: When Sam spies Richard, the passers-by are not continuous between shots.
I heart ny - S4-E18
Continuity mistake: When Sam says she's a love-aholic Miranda is holding her mug then not.
Continuity mistake: The clerk at the wedding dress store closes the book next to her, but a shot later it's open.
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