The intro cut scene for Sexual Deviants shows Daniel and Leo hiding behind a car as they scout the club up ahead. The car featured is known within the Grand Theft Auto franchise as a 'Voodoo'.
If you listen to the background music during the introduction cut scene for the mission ‘Life’s a Beach’ in Grand Theft Auto: San Andreas you will notice that it is the very same piece of music used in the porn theatre for the episode ‘Safe House’ in Manhunt 2.
The episode ‘Assassination’ features a billboard advertisement for 'Thirdleg Clothing', this advertisement was first seen in the October 2005 release of Grand Theft Auto: Liberty City Stories.
Grand Theft Auto: Vice City Stories features fast food chain by the name of 'KING KNUTS', the logo of which is a king's crown. In Manhunt 2 there is a street gang known as the 'Red Kings' who also have a king's crown as their insignia, which can be seen carved into the walls surrounding ‘Red Light’.
The Police Maverick in "Assassination" and "Domestic Disturbance", is also in Grand Theft Auto Series: Vice City, San Andreas, GTA IV, Liberty City Stories, and Vice City Stories.
The episode ‘Assassination’ features several billboards from GTA LCS: Sprunk billboard and the Silent Death movie billboard. This episode also features a billboard with a strriper from GTA San Andreas.