Factual error: The day Carrie arrives in NY: June 11, 1986 was a Wednesday not a Tuesday.
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: In the scene where Carrie is in the elevator, arguing with Charlotte and Miranda who are in the hallway, Miranda keeps changing from being fully made-up to almost no make-up at all.
Continuity mistake: When the girls are eating lunch in the desert, and the hot Australian guy pulls up and chats the girls up, they show where he came from and the tire tracks in the sand. However, the tracks don't go back that far, so the guy really wasn't driving all around the sand dunes like Carrie's narration says.
Continuity mistake: In the conclusive, third act of the film, Charlotte and Miranda are sipping drinks and discussing the difficulties of motherhood. During the scene, Charlotte's drink varies from nearly empty to entirely full and then back to being nearly empty over the course of only a few frames.
Continuity mistake: When Carrie goes to the changing room with Stan, her boutonnière is labeled Carrie Preston. When she questioned this, Stan says the wedding planner said all couples should be listed by their married name. But in the shot of the program she is listed as Carrie Bradshaw under the best man.
Character mistake: When Miranda is scheduling the trip to Abu Dhabi with the girls, she says they have to go within three weeks or the next month will be the hottest month. However, on the first night when Carrie can't sleep, her alarm clock says August 26. August is the hottest month in the middle east.
Continuity mistake: After Charlotte's cellphone falls on the sand, it keeps changing positions depending on the shot.
Continuity mistake: When the officer opens the passport and the condoms fall on the table, their positions change between shots.
Audio problem: When Mr. Big and Carrie are talking in the bathroom, from a shot from behind while he talks his jaw moves up and down, but for several seconds he is quiet but his jaw keeps moving. Surely the audio belongs to the front shots.
Continuity mistake: In the bathroom, Big says "I feel like I'm disappointing you" and touches his face with his right hand. A shot later his arm is lowered. (00:54:20)
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 Carrie is buying shoes at the souk, the seller's hands are on the counter or not depending on the shot.
Continuity mistake: In the bar in the plane, Miranda puts down her pencil. Close up of her hands and she is putting it down again. Wide angle of her and it's back in her hand. (00:57:57)
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: While having breakfast, Carrie drinks from her mug, but it disappears in the angle shot from behind her.
Continuity mistake: During breakfast, Lily exits to the right but disappears in further shots.
Continuity mistake: When the girls are having breakfast, Miranda is pinching food and eating it, then a shot later her hand is lowered, but a shot later the fork is gone. All in a matter of two seconds. (00:49:10)
Continuity mistake: When Charlotte watches Erin bathing Rose, she places her hand on the door frame. In the POV shot Charlotte's hand disappears.
Answer: In the script.