Easter Eggs are details added to Sleeping Dogs by the developers that make reference to external sources.
Clothing
Wei Shen wearing a red awareness band.
- Awareness Band (Red) - "Wrist Injury Awareness!"
- The description of this item makes reference to July 26, 2007, when television pundit Stephen Colbert broke his wrist and subsequently launched a "WristStrong" bracelet line to bring awareness to wrist-based injuries. Though his cast was removed on-air on August 23, he continues to wear his "WristStrong" awareness bracelet during broadcasts of The Colbert Report.
- Ikoze Sports Watch
- The Ikoze Sports Watch likely refers to Casio's G-Shock watch series, which are tough and comes in many colors, hence the in-game description of the watches which contains the word "indestructible". The in-game Ikoze Sports Watches also come in many colors.
Costumes
Bruce Lee outfit
- Hai Tien Jumpsuit - Game of Death (Bruce Lee)
- Shen Zen - Fist of Fury (Bruce Lee)
- Mr. Black - Reservoir Dogs, A Better Tomorrow
- Bon Gak - Ong Bak (Tony Jaa)
- Hog Pen Row - Kung Fu Hustle (Stephen Chow) (the name Hog Pen Row is a play on Pig Sty Alley, the main setting of Kung Fu Hustle)
- Manhattan Melee - Rumble in the Bronx (Jackie Chan)
- Part Time Assassin - Fulltime Killer (Andy Lau)
- Inspector Suit - Police Story, Infernal Affairs
- Rico Rodríguez - Just Cause 2
- Wing Chun Master - Ip Man (Donnie Yen)