Rockstar Games, the publisher of the Grand Theft Auto and Manhunt series, have included many references to their other games in the Manhunt series.
- The sound effect when James Earl Cash picks up a weapon, or painkillers is the same sound effect from Grand Theft Auto III, when Claude picks up a weapon or health.
- The setting of the game, Carcer City, is said to be a neighboring city to Liberty City, and is mentioned in Grand Theft Auto III, Grand Theft Auto: Vice City and Grand Theft Auto: San Andreas.
- The Maibatsu Monstrosity, a motorcycle in Manhunt, was advertised in Grand Theft Auto III as a very fuel-inefficient SUV.
- Also mentioned on the radio in Grand Theft Auto III are police reports regarding Gary Schaffer, the corrupt Police Chief who is found not guilty following the disappearances of key witnesses.
- The shop Ryton Aide, which appears in Grand Theft Auto: Vice City, appears as an abandoned shop in Manhunt.
- "Sprunk", the fictional soft drink advertised on the radio and sold in the soda machines all over several games in the Grand Theft Auto series is also present in Manhunt.
- Shopping bags for "The Gash" (a play on "The Gap"), a clothing shop in the Grand Theft Auto series can be seen a few times in the game.
- In Grand Theft Auto: San Andreas, the stealth kill has the same animation as the Hasty knife execution from Manhunt.
- A lot of objects, such as the hippo statues in the Carcer City Zoo, were later reused in Grand Theft Auto IV.
- Most of the vehicles in the game were reused from Grand Theft Auto series (ex. Stallion, Trashmaster, Voodoo), although some of them has a slightly altered model. The same applies to Manhunt 2.
- In Safe House, at the beginning there is a t-shirt on the floor that says Suburban, which is a clothing store in Grand Theft Auto: San Andreas.
- Many of the removed weapons, and lures use the same models as in Grand Theft Auto: San Andreas (ex. Cane, Dildo, Flowers).
- Also in the Safe House level, in the Porn Theatre the music playing can be heard in the opening cutscene in the Grand Theft Auto: San Andreas mission "Life's a Beach".
- The balaclava that one of the Watchdogs wears is the same one CJ wears in the burglary missions in Grand Theft Auto: San Andreas.
- When chasing Danny, one of the Red Kings sometimes says "run all the way to San Andreas ya little prick!"
- In the PC version, when Danny breaks a bottle, the same sound effect from The Warriors is used.
- The Sawn-Off Shotgun uses the same model as the one in Grand Theft Auto: San Andreas.