Continuity mistake: When Carrie is feeling depressed in Mexico and is being fed food in bed by Samantha, there is a tea pot on the tray on the bed. The scene changes back and forth between Samantha and Carrie and each time it changes, the style of the tea pot completely changes. When it's a shot of Samantha, it's a regular tea pot with a lid, and when it's a shot of Carrie, it changes to an art deco style pot with no lid whatsoever.
Continuity mistake: In the scene where Carrie and Big are in bed (Carrie is reading the Love Letters) the library card Carrie uses as a bookmark keeps changing position. She opens the book and holds the card behind the book cover, then when you see a close-up of the text you can see the card is being held inside the book. Then it's back behind the book cover. (00:22:25)
Continuity mistake: When Charlotte, Anthony and Carrie are planning the wedding, Carrie has a pen attached to her dress strap which keeps changing positions (it doesn't disappear, we can still see its black cap) while she is sitting on the bed and when she gets her wedding dress out of the closet. (00:16:00)
Continuity mistake: When Louise calls Carrie from the bridal salon, her little sister is visible in the mirror's reflection as she holds Louise's Louis Vuitton bag on her lap. In the reflection the back of the Louis Vuitton bag faces out, but in the sister's close-up the bag's distinctive front faces out, then in the next shot it's the back again. (02:09:30)Super Grover