Continuity mistake: In the scene where Carrie is telling the girls about kissing Aidan, her necklace (a crescent moon) keeps switching sides. (01:48:45)
Character mistake: In the scene where Carrie is printing an article she has written, the title reads: The Terrible Two's. A successful, educated writer would never have used an apostrophe to pluralize a word. Ever.
Continuity mistake: On the plane, the stewardess places a cocktail in front of another glass, but one glass disappears in the immediate next shot.
Continuity mistake: When Erin is bathing Rose, Erin's hair is dry but in the close-up it's wet. It isn't until several seconds later that she gets showered all over. (00:29:40)
Continuity mistake: When Charlotte watches Erin bathing Rose, she places her hand on the door frame. In the POV shot Charlotte's hand disappears.
Continuity mistake: During breakfast, Lily exits to the right but disappears in further shots.
Continuity mistake: When Big tells Carrie he wants a place of his own, the pink ribbon on the shelf keeps changing positions between shots. (00:52:47)
Continuity mistake: Carrie places the gift box on the table skewed, but when the shot changes it is lying straight.
Answer: In the script.