Deleted Scene: All of Shirley Kwan's scenes were cut after Kar-Wai realized that her scenes would conflict with the theme of the movie.
Writing by the Seat of Your Pants: As usual with Wong Kar-wai, the film was shot without a script, which caused problems when Kar-Wai couldn't break the story of the movie for two months while they were already filming in Argentina. Ultimately, Leslie Cheung had to leave production because of other commitments that led to Kar-Wai finally figuring that the movie would be from Lai's perspective. This also led to Chang Chen getting hired.
The TV Series
Adaptation Displacement: Most Russian fans either don't bother watching the original show, or don't know it exists.