Filming was shifted from Beijing to Macau after Chinese authorities demanded to see the completed script. The director never uses scripts.
The number of the hotel room where Chow stays is 2046, which is the director's next feature length film.
Maggie Cheung wears a different cheong-san dress in each scene. There were 46 in all, though not all made it to the final cut.
Kar Wai Wong was shooting the finale, and editing the film a little over a week before its debut at Cannes.
Chosen by "Les Cahiers du cinéma" (France) as one of the 10 best pictures of 2000 (#05).
Filming took 15 months.
Maggie Cheung's hair and make-up took five hours a day.
Director Kar Wai Wong found the English title for "In the Mood for Love" while listening to a song from a Brian Ferry CD with a similar title, "I'm in the Mood for Love". It is a cover of a 1930s song with the same title, Kar Wai Wong used the title and the song in an early Hong Kong trailer of the film, and it was also used in the USA trailer of the film.
During filming, Kar Wai Wong improvised often with the actors, crafting the story and mood of the film as he went along. Originally, "In the Mood for Love" was a much more obvious romance film, with the actors throwing witty dialog at each other and engaging in several scenes of love-making. Eventually, the actors and director decided to tone the mood down to the more subtle version that was released in theaters.