When Carrie first meets Aidan, he picks her up, and her large bag disappears and reappears several times.
From the time we first see Carrie in her "best man" outfit to the time she and Big arrive at the wedding, Carrie's hairstyle changes. It is not slicked back and she does not have a braid. Perhaps we are meant to think she changed it, maybe opting for a simpler style (something easier to redo) after she and Big spent the hour in bed, but it is not addressed in the film.
When Carrie has her meaningful discussion with John in their apartment, she sits down in a chair and crosses her left leg over the right one. Uncrossing her legs, she throws a cushion onto an opposite chair. In the wide shot that follows, her legs are still crossed.
When the ladies arrive in Abu Dhabi airport, their bags are tagged JFK for New York's John F. Kennedy airport, where they're departing from. The bags should be tagged for their final destination AUH, for Abu Dhabi.
While flying to the UAE, Carrie, during an internal monologue or narration, stated that they were flying over Africa. If a flight left New York for the Middle East, it would not take a route over Africa. It would likely fly closer to the North Pole because the circumference of the earth is smaller near the poles than near the equator.
According to The Carrie Diaries (2013), the prequel to Sex and the City (1998), Carrie met Samantha before meeting Charlotte, but in this film's "1986" scene, that order is reversed. However, The Carrie Diaries came out two years after this film and so any continuity goof would be the fault of that series, not this film.
When Samantha hands her passport to the hotel manager in Abu Dhabi, it appears to have a picture of a man with short dark hair.
When the girls are in the restaurant the morning after the wedding, Rose is played by a stand-in baby who looks very different from the Rose of the rest of the movie.
When the girls are at the hotel pool, Miranda covers Samantha up but when the camera goes back to Samantha, her legs are uncovered again.
When the girls are drinking cocktails mid-flight, there doesn't appear to be any movement or vibrations on the surface of the drinks.
Samantha's new beau, Rikard Spirt, is supposedly Danish, and yet he talks with a noticeable Northern English accent (actor Max Ryan is from Northern England).
The men playing the Australian Rugby Team do not resemble real rugby players. Professional rugby players are far more heavily built, such is the nature of the game. These men looked more like soccer players.
During the flashback of the characters in 1980s New York, several trendy automobiles (including two Ford Victoria taxis) drive past the camera.
Miranda says that the Arabic word for "yes" is "haanji." It's actually "aiwa" or "na'am"; "haanji" is the Punjabi word for "yes."
Carrie mentions her first day in New York was Tuesday, June 11, 1986. That date fell on a Wednesday.