The in-game series, Righteous Slaughter, is a parody of the Call of Duty series.
Michael says that his first bank heist was in Carcer City, the setting for Manhunt.
John Marston, the protagonist of Red Dead Redemption, is seen in a Pisswasser commercial, riding a horse.
An artwork of John Marston can be seen on a pedestrian's shirt. (One can be found in the Daddy's Little Girl mission)
As part of a treasure hunt even in Grand Theft Auto Online, the player would receive a message on their phone from "firstname.lastname@example.org", which is a reference to the character Dutch van der Linde from Red Dead Redemption