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Infernal Affairs (2002) Poster

Trivia

The alternative ending found as a special feature on most Western DVD releases was created for release in China, where the authorities were uncomfortable with the political implications of the original ending.
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When Yan and SP Wong are waiting at the elevator, the digital floor counter skips the 4th floor. In China and Hong Kong, the number 4 is considered bad luck because it sounds similar to the word 'death'.
When referencing this film as the inspiration for the Best Picture-winning The Departed (2006), the announcer at the 79th Academy Awards mistakenly identified the Hong Kong production as Japanese.
The psychiatrist's name, "Lee Sum Yee", is a homophone (in Cantonese) for "your psychiatrist".
The English title is a play on words mixing Ming's job in the IA, the infernal nature of both characters' double lives, and finally Dante's Inferno, relating to the original Cantonese title.
Martin Scorsese, director of The Departed (2006), claims he was unaware that his film was a remake of this one during filming.
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Tony Leung Chiu-Wai and Anthony Chau-Sang Wong were both in Hard Boiled (1992), where Leung also played an undercover cop. In both films, he receives a gift from a superior officer, (a cigarette lighter in that film and a watch in this one).
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The hi-fi shop scene was later recreated with additions of excerpts of the film to encourage businesses to join the Quality Tourism Services Scheme in Hong Kong.
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Yan and SP Wong briefly enter a stairwell before Wong takes the elevator. The number "4" is visible on the far wall, which is bad luck in China and Hong Kong as has been mentioned before.
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The film had been selected as the Hong Kong entry for the Best Foreign Language Film at the 76th Academy Awards but it was not nominated.
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Spoilers 

The trivia item below may give away important plot points.

Body Count: 8.
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See also

Goofs | Crazy Credits | Quotes | Alternate Versions | Connections | Soundtracks

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