Each character speaks their own languages. Mr. Chow speaks Cantonese, Bai Ling speaks Mandarin, and Tak speaks Japanese even when talking to each other. Even so, they seem to understand each other perfectly.
The camera points to the left side of Faye Wong's face when she cries. She has problems crying with her right eye, so Wong Kar-Wai shot her crying scenes on the left side of her face. However, there is one scene where the camera films the right side of her face purposely.
While 2046 was being filmed, a photographer from Sudden Weekly, a Hong Kong tabloid, bribed his way onto the set. After his pictures of the interior of the Oriental Hotel were published, Wong Kar-wai ordered the set to be rebuilt. The photographer was subsequently sentenced to three months' jail for corruption.
Originally conceived as a story of a hit man in Bangkok (hence the casting of Thai actor Bird Thongchai McIntyre). The hit man was to be played by Japanese superstar Takuya Kimura, and the events to be played out in a hotel in room 2046.
The wrapping paper on the gift Mr. Chow gives to Bai Ling is very faintly imprinted with the words "Dragon Seed". The Dragon Seed Co. Ltd. is a chain of Hong Kong department stores that was first incorporated in 1948.