Though this movie was nominated for Best Adapted Screenplay, the screenplay is not based upon any existing text. However, the Academy rule book says that all sequels are adaptations.
The man and woman that Celine speaks to in the courtyard of her apartment are played by Julie Delpy's real parents, Albert Delpy and Marie Pillet.
Julie Delpy wrote and performed three songs for the soundtrack.
Since the film takes place during the mid-late afternoon, it was the only time of day director Richard Linklater would shoot the scenes in the film. He felt it added to the hyper reality of the film, and often relied on the actors to get perfect takes at the right time.
Jesse's last name is Wallace.
This film was made 9 years after the first film, which is the length of time between the events in each story.
The CD they listen to in Celine's apartment is "Tomato Collection" by Nina Simone.
Celine says to Jesse "You're a Scorpio, I'm a Sag (Sagittarius), so we get along." These are Ethan Hawke and Julie Delpy's signs in real life.
Ethan Hawke's character Jesse is in a failing marriage with a woman he married because she had become pregnant. Soon after the film's release, Hawke divorced his real-life wife Uma Thurman, whom he had married while she was pregnant with their first child.