When Carrie and Big reunite in the closet, Big's clock shows the time as 7:30. However, Carrie arrives after 5:00 pm, and they have to leave by 6:00 pm for the new tenants.
In the scene where Carrie starts beating Big with the flowers for standing her up at their wedding, she throws the entire bouquet at him when she screams, "I'm humiliated!" and in the next shot she has the flowers back in her hand and she hits him again.
After the waiter in Mexico gives Charlotte her bottled water (and she wipes off the mouth of it), the next shot shows the bottle of water on his tray as he places another margarita on the table.
When the wedding guests wait for the bride and groom to arrive, Stanford wears different glasses than in later scenes. He may have changed his glasses while waiting, but that seems unlikely.
When Samantha is lying on the table covered in sushi and the phone rings, she moves and the piece of sushi on her shoulder falls down. A piece of double-sided tape is visible, to hold the sushi in place. Time passes, but it's understood Samantha never leaves the table and remains covered in sushi. When the shot returns to her close up, the piece of tape has been removed from her shoulder.
Carrie returns books to the main branch of the New York Public Library. That branch has not been a lending library for more than 60 years.
The license plates on Big's Mercedes-Benz are obviously fake. New York State plates have three letters followed by four numbers on them. The plates on Big's car have three letters, then a mix of letters and numbers for the last four characters.
You cannot check books out from the 42ST library that Carrie has her wedding at. It is a research library and books from there are can only be read in the reading room.
When Carrie gets her new cell phone, she complains that her new number is a different area code. Cell customers can move their numbers between phones and carriers. Carrie had changed her number to avoid contact with Mr. Big.
In the The Domino Effect (2003), Mr. Big has surgery to remove a blockage from his heart. In the bed scene, he has no scars on his chest. Heart surgery can be performed by going in through the thigh, arm or neck, especially for simple blockages or stents.
Carrie, Samantha, Miranda and Charlotte leave Charlotte's apartment and enter the limousine to go to the wedding. When the limousine arrives at the site of the wedding and pulls up to the curb, it's clearly empty.
Miranda and Carrie have an argument on Valentine's Day, then don't talk for 3 days. When Miranda shows up in a taxi a few days later, it's raining, and the trees, shrubs, and grass are all green. Spring doesn't come to Manhattan that quickly.
When Dante is first shown having sex he goes from sitting to standing. When he stands, a flash of the nude-shade band of his underwear shows between the actors' bodies.
When the four girls are packing Carrie's stuff into boxes, and Charlotte bumps into one stack of boxes, they are clearly empty.
When Carrie reads the poets-letters to Big, she puts her glasses in her forehead to ask him if he had ever written her a love letter. In the next scene the glasses have changed position and they are on the top of her head.
In the beginning of the movie, when Carrie gives background information on Charlotte, she quotes her telling Harry "We're not barren, we're reproductively challenged." Charlotte actually said that to her first husband, Trey, in Sex and the City (1998).
When Carrie reads emails from Big, they are all dated in September, when New York City observes Daylight Saving Time. The time stamp on the email incorrectly reads "EST" for Eastern Standard Time, when it should read "EDT" for Eastern Daylight Time.