Chang Chen's storyline was completely improvised. Director Wong Kar-Wai discovered the restaurant, China Central, by chance and, seizing Leslie Cheung's absence due to a concert tour, decided to keep shooting. Chang's plot was thus created.
Tony Leung Chiu-wai agreed to do the film on the basis of a fake script. He only learned of the requirement of doing a gay sex scene after arriving in Argentina for filming.
Fearing that it would be difficult to continue making his films in Hong Kong after it was transferred to China in 1997, Wong Kar-Wai decided to make a film overseas. He was able to get funding from Spain under the condition that he made the film in a Spanish-speaking country. He chose Argentina because of his affinity for Argentine author Manuel Puig.
The date stamped on the passport in the opening scene roughly lines up with the expiration date on the pineapple tins in Wong Kar-Wai's earlier film Chung Hing sam lam (1994).
The Chinese title is an idiom that suggests "a glimpse of something intimate." The literal translation is "spring light at first glance."