"Love Letters of Great Men", which Carrie borrows from the library, did not exist at the time of the film's release. Demands from fans wishing to purchase the book, led to many editions of a "Love Letters of Great Men" book being published, such as those by Ursula Doyle and Becon Hill.
The note given to Carrie, letting her have the wedding dress, was written by Vivienne Westwood.
The book that Carrie removes from a display, and replaces with her own, when she's on the phone in the bookstore, is "Lucia, Lucia" by Adriana Trigiani, which tells the story of another woman who had planned a lavish wedding, and was left at the altar.
Carrie's famous desk is now a part of the Smithsonian's permanent collection. Michael Patrick King wrote to the directors of the institution, pleading to borrow the desk to re-create Carrie's apartment.
Domestically it was the highest grossing R-rated female comedy until Bridesmaids (2011). However, as of 2018, it is still the highest grossing R-rated female comedy at the worldwide box office.
The tutu outfit that Carrie models for the girls, is the same outfit she wore on the Sex and the City (1998) opening credits.
Carrie has the same cell phone as she did in Sex and the City (1998). To show how much time had passed, the producers added tape to it to make it seem worn.
This may be the first movie to feature an iPhone. Carrie needs to call Mr. Big, so Samantha hands her an iPhone. Carrie hands it back, flabbergasted by the many non-phone buttons.
The film was originally slated for production shortly after the end of the television series in 2004. Production stopped when Kim Cattrall pulled out of the film, unable to reach a salary agreement with HBO. They finally reached a settlement in 2007, including a series deal for Cattrall.
The Vogue fashion shoot used the real Vogue team: Photographer Patrick Demarchelier, Hairstylist Serge Normant, Make-up Artist Gucci Westman, Prop Stylist Mary Howard, West Coast Editor Lauren Howell, Contributing Editor Plum Sykes, and Editor at Large André Leon Talley (who also coached Sarah Jessica Parker on how to pose authentically).
When Carrie and Mr. Big are reading in bed, Patricia Field had initially dressed Sarah Jessica Parker in a t-shirt and leggings. Michael Patrick King was concerned they looked too comfortable. He said it was important to show the contrast between Steve and Miranda, who weren't having sex, and Carrie and Mr. Big, who were.
The main love letter referenced: Ludwig van Beethoven to his "Immortal Beloved" / Letter 1 / Good morning, on July 7 // My thoughts go out to you, my Immortal Beloved / I can live only wholly with you or not at all - / Be calm my life, my all. Only by calm consideration of our existence can we achieve our purpose to live together. / Oh continue to love me, never misjudge the most faithful heart of your beloved. / Ever thine....Ever mine....Ever ours.
Carrie wore one vintage belt so often, that the Costume Department nicknamed it "Roger". Costume Designer Patricia Field had to tell Sarah Jessica Parker to take it off, because she was wearing it too much. She wears it when: Carrie and Mr. Big find their dream apartment, Carrie tells Charlotte and Miranda that she is getting married, Carrie goes to the Vogue meeting, Carrie and Miranda go Halloween costume shopping, and Carrie and Miranda go to dinner on Valentine's Day.
Manolo Blahnik sales skyrocketed because of the peacock blue satin heels featured in the film. However, the designer was not a fan of the publicity. He said in 2009: "We had a very good year last year, thanks to those stupid satin shoes... If people talk to me about Sex and the City, I get sick."
In an interview, Writer and Director Michael Patrick King admitted filming major outdoor scenes that were never meant to take place in the film, to throw the paparazzi off. Due to the presence of the paparazzi and media, several exterior scenes had to be filmed indoors.
The Vogue fashion shoot is the only scene in the movie that isn't fashion directed by Patricia Field.
Victoria Beckham was offered a cameo role, but had to turn it down, due to scheduling conflicts with Spice Girls tour rehearsals.
To keep the plot a secret during the shoot, Sarah Jessica Parker put a fake cover, "National Park" by Jesse Lasky, on her copy of the script to keep prying eyes away.
Presumably, Smith won the two Golden Globes in Samantha's Los Angeles office. They were Producer John P. Melfi's Golden Globes, which he won for the television series. Director Michael Patrick King said he would've used his own, but they were in New York City, and he didn't know how to get them on a plane.
Althrough rated R in the U.S., the film received an "all ages allowed" rating in Sweden and Denmark.
According to Patricia Field, the flower ring that Smith buys for Samantha is worth about $50,000.
The world premiere was held in London, and not in New York City, which was heavily criticized by fans of the New York-set show. The explanation for this was the producers wanted the American premiere to be as close to the release date as possible, which would heighten hype and allow for the cast to promote the film in the U.S.
For the auction scene, Michael Patrick King originally wanted a paddle with "69" on it. It wasn't available, so "969" was used instead.
The movie was released ten years after the series started, and four years after it ended.
When Carrie shows Charlotte and Anthony her label-less vintage suit, the pen tucked in Carrie's dress is a Pilot Varsity disposable fountain pen, the same pen she always used in the series.
When Miranda is searching for a new apartment and says, "coming or going?", one of the men carrying the couch to a moving van in the background is multiple Tony award-winning actor/playwright Lin-Manuel Miranda.
At the end of the movie, Carrie is shown reading an excerpt from her new book and says "And as I put my wedding dress away, I couldn't help but wonder, why is it that we're willing to write our own vows, but not our own rules?" The sequel to this movie references the ability of each couple to create their own rules for their relationship.
In the scene when Carrie is returning some books to the library, Sarah Jessica Parker is not wearing any mascara. Also in this scene, she is carrying a hat which she never wears, as it was actually too small to fit on her head.
In the DVD commentary, Michael Patrick King states that Joseph Pupo, who was five at the time of filming, had previously played Brady Hobbes in the last season and a half of "Sex and The City" when he was a baby.
During the scene where Carrie and the girls are going through all her clothes and Carrie flips through a handful of old record albums, the album in the purple sleeve seen so prominently is Duran Duran's 1982 album "Rio".
When the ladies are walking to Fashion Week, Carrie says it's "spring" when it's still winter, due to the snow and ice on the ground. When Carrie says "spring", it is because they're going to the Spring shows at Fashion Week, which occur in early to mid February. It's "spring" to the women, because of the fashion they'll be seeing. However, there is often snow in spring in New York City, as well as other northern states, often well into April.
In this movie, Carrie hires an assistant, whose name is Louise, from St. Louis. In season five, episode one, "Anchors Away", of the series, Carrie meets a sailor named Louis, who was from Louisiana.