The scene where Joe accidentally closes the door of Kathleen's shop on the balloons was unscripted. Tom Hanks actually did that, and ad libbed the line, "Good thing it wasn't the fish." Nora Ephron thought it was so funny that she kept it in.
The children's bookstore scenes in the film were actually filmed at Maya Shaper's Cheese and Antique Shop on 103 West 69th Street. The film makers wanted to use the antique shop because it had the quaint, homey feel they were going for. They sent the owner of the antique shop on vacation for a few weeks and while she was gone they turned the store into a children's bookstore. After filming was finished, they put everything back the way they had left it, and it became an antique store once again.
The location of Fox Books in the movie is actually the location of a real-life Barnes & Noble, on Broadway and 83rd Street on the Upper West Side. The Barnes and Noble generated considerable neighborhood opposition when it opened in the early 1990s, as many feared it would drive a local bookseller, Shakespeare & Co. on 81st Street, out of business. This is exactly what happened.
Joe Fox (Tom Hanks) is obsessed with The Godfather (1972), and frequently uses dialogue from it to shape his philosophy on life. In the Coppola Restoration Godfather DVDs, Alec Baldwin claims that Hanks and Rob Reiner are both Godfather aficionados, and have hosted viewing parties where the attendees play drinking games and quote famous lines while watching the film.
A remake of the 1940 film The Shop Around the Corner (1940) starring James Stewart and Margaret Sullavan. The original film involved two employees at a leather goods store. (In the source play it was a perfumerie). They could not stand each other at work, but were unknowingly falling in love through the mail as anonymous pen pals.
The movie's opening and ending titles make use of commonly seen computer images of the time, specifically Windows 95/98. The ending title song, which begins just after the words "The End" appear on the screen, starts with an adaptation of the "startup" sound from Windows 95.
The passage that we see Kathleen Kelly reading during her bookshop's story time to a group of kids (including Joe Fox's aunt and brother) is from "Boy: Tales of Childhood", an autobiographical children's novel written by Roald Dahl.
Kathleen Kelly's bookstore in the film was based largely on Manhattan's Books of Wonder in Chelsea on 18th Street. Meg Ryan worked the counter at Books of Wonder for a day as part of her preparation. Decorative props from the film can still be seen at the store.
Joe Fox's grandfather mentions that long ago, he briefly shared a pen pal romance with the store's previous owner, Cecilia Kelly (Kathleen's mother), and that they only communicated through letters. This may have been a reference to the movie's predecessor, The Shop Around the Corner (1940), starring James Stewart and Margaret Sullavan, or possibly the movie 84 Charing Cross Road (1987), with Anne Bancroft and Anthony Hopkins as a female customer in New York and a male employee of the bookstore at that address in London.
Nora Ephron arranged for Meg Ryan and Heather Burns to work in a real New York City bookstore in preparation of their roles prior to filming. The store was Books of Wonder in Manhattan, and the jobs lasted for about a week.
When Ryan's and Hanks' characters finally meet in person, with both knowing that they've been e-mailing each other, the song "Somewhere Over the Rainbow" plays on the film's soundtrack. The duo also shared a scene set to the song in "Sleepless in Seattle."
One thing that distinguishes this film from any prior source material (Hungarian play, Hollywood movie, Hollywood musical, Broadway musical) is that both main characters are in relationships while they flirt with each other. The leads in all other versions were single. The idea of infidelity does come up in all but the Hollywood musical, but it's such a terrible transgression that the characters involved are duly punished for it.
In this film, which is written by Nora and Delia Ephron, Meg Ryan plays a woman who falls in love with a man she has never met. At the same time, she befriends the same man in real life while believing him to be a different person. This is a similar situation to the 1955 musical Daddy Long Legs, which was written by Nora and Delia's parents, Henry and Phoebe Ephron.
In the opening lines of the movie, Frank is describing how the state of Virginia had to have solitaire removed from their computers, because that hadn't gotten any work done in six weeks. This line is actually based on some fact. In December of 1994, Governor George Allen of Virginia, did in fact order that all video games (specifically minesweeper, hearts and solitaire), be removed from all state computers, because of a concern that state employees are playing the games during office hours, and wasting tax payer dollars.
Meg Ryan's character, Kathleen Kelly, uses a Macintosh PowerBook G3 "Kanga", (introduced 11/97), or a Macintosh PowerBook 3400c, (introduced 2/97) in the movie. The exact model she used can't be determined from looking at the outer plastic case, as both machines used the same plastic case.
While Tom Hanks is meeting Meg Ryan for a date, but doesn't reveal himself, Meg Ryan makes fun of Hanks' name "Joe" and makes nasty references to young women with one name, like "Kimberly." In When Harry Met Sally, Ryan's character's boyfriend "Joe", gets engaged to a girl in his office named "Kimberly."
For opening credits, Ephron wanted an animated version of Broadway's Boogie-Woogie, a representation of New York City by Piet Mondrian. When animator Mirko Ilic and his staff animated Mondrian's painting, Ephron wanted something more "realistic or romantic" so they photographed all of the buildings along Broadway on the Upper West Side, from 72nd Street to the brownstone where the film begins, as a guide for the computer graphic animation.
The scene where Kathleen and Frank decide they're not into each other, was filmed in the same theater where press screenings and the New York City premiere of "You've Got Mail" in 1998, were held (Lincoln Square on the Upper West Side).
In the party scene, Tom Hanks' character responds to Kathleen's comment "that caviar is a garnish!" by scooping up all the remaining caviar for himself. In the movie Big (1988), Hanks' character tries caviar at a party, which he hates; he spits it out & wipes his tongue with a napkin.
Several references to The Wizard of Oz: full shelf of The Wizard of Oz books on the shelf behind Kathleen when she opens the door for Jessica and Maya, ruby slippers ornament that Kathleen is placing on the Christmas tree, The Scarecrow of Oz book opened on Kathleen's bed when Joe visits her place, "Somewhere Over the Rainbow" playing in the closing scene.
Joe Fox (Tom Hanks) tells Kathleen Kelly (Meg Ryan) about Pride and Prejudice, "I bet just you love that... Mr. Darcy, and your sentimental heart beats widely at the thought that he and... well, you know, whatever her name is, are truly, honestly going to end up together." While he can't recollect the name of Elizabeth Bennet, in reality, Tom Hanks has a daughter named Elizabeth.
The trivia items below may give away important plot points.
Could arguably be a modern re-telling of Jane Austen's "Pride and Prejudice," of which Kathleen is a fan. Joe Fox mimics the story's male protagonist Mr. Darcy (Pride), while Kathleen Kelly mirrors the female protagonist, Elizabeth Bennett (Prejudice.) Like the novel, the two meet under casual circumstances only to end up at odds with each other due to differing views and opinions. Like Elizabeth, Kathleen becomes determined to hate Joe Fox due to his proud disposition. But, their continued encounters lead them to eventually fall in love. The redeeming factor of the novel however, is inverted in this film. In the story Darcy finally "wins over" Elizabeth when she learns of the noble service he selflessly performs for her family. Joe Fox on the other hand, does Kathleen a great "disservice" by putting her out of business; making the story somewhat unique as the two fall in love in spite of this.
The song at the end of the film when they are standing on the bridge is "Somewhere Over the Rainbow". A clip of this song is played in the previous movie with Meg Ryan and Tom Hanks, Sleepless in Seattle (1993).
This movie's screenplay is based loosely on The Shop Around the Corner (1940), starring James Stewart and Margaret Sullavan. Kathleen's store is named The Shop Around the Corner, the two main characters are latter day (mail) and present day (e-mail) "pen pals"; they both know they are falling in love with their respective pen pals; when the man realizes who the woman really is, he pursues her, but is not sure the love match will work; in the end, they find they belong together.