On the eastern side of the Del Perro Pier a piece of graffiti can be found reading 'Nothing to see here - groove along' accompanied by a small illustration of a smiling face. This may be a reference to a similar sign in Grand Theft Auto III.
In Franklin's house in Vinewood Hills on one of the bookshelves, there is a book entitled "The Liberty King" with the face of Donald Love from Grand Theft Auto III. This easter egg appeared in previous GTA games too.
The Los Santos Country Club was established in 1992, a nod to the year of the setting of GTA San Andreas.
The mission Reuniting The Family in which Michael and Amanda get back together is perhaps a reference to the Grand Theft Auto: San Andreas mission, Reuniting The Families. This mission involves a sit down with Grove Street Families, Temple Drive Families and Seville Boulevard Families at the Jefferson Motel to iron out their issues.
The San Andreas Flight School was established in 2004, the same year Grand Theft Auto: San Andreas was released.
During the mission, Eye in the Sky, the pilot that is flying with Trevor will remark that the "LSPD have come a long way concerning racism in the last two decades". The pilot may be referencing the events of Grand Theft Auto: San Andreas and C.R.A.S.H - which would also reference the Los Angeles Riots in 1992.
Writing on the side of trains reads "LS2004", possibly a nod to Los Santos and the year Grand Theft Auto: San Andreas was released.
During the mission Hood Safari, on the last turn before arriving in Grove Street, there are three people riding BMXs down Grove Street away from the cul-de-sac. They closely resemble C.J., Sweet and Big Smoke in the events of Sweet & Kendl mission.
Niko Bellic has a LifeInvader page that can only be seen in Jimmy's laptop.
In his page there is also a photo of Roman Bellic.
There are some wanted posters of Niko Bellic.
In the mission "Casing the Jewel Store" Lester says "Well there was an eastern european guy making moves in Liberty City but... nah, he went quiet." This is a reference to Niko Bellic.
In one Yellow Jack Inn bar there is a coat that resembles Niko's. Also in the same bar there is a photo of a truck where the driver looks significantly similar to Niko.
There are some rare car license plates that say "NIKOB"and "ROMANB". These are references to Niko Bellic and Roman Bellic. Also the car that have the license plate resembles Roman Bellic's car.
There is a rare motorcycle license plate that says "LUISLOPZ". These is a reference to Luis Lopez.
Karen Daniels from GTA IV appears in several missions.
Patrick McReary appears in the random event Getaway Driver and he can become an optional accomplice for heist missions.
In random conversations in heist missions, Patrick talks about events and characters from GTA IV.
There are some newspapers with Johnny Klebitz photo.
Johnny Klebitz, Terry Thorpe and Clay Simons appear in the mission "Mr. Philips"
Bruce Kibbutz is the spokesman for Bull Shark Testosterone supplements. He can be seen in BST website. There is a Weazel News report about the effects of Bull Shark testosterone, both of which mention Brucie as the spokesman.
Brucie appears in GTA Online and contacts the character after they reach rank 17, informing them that he will order Bull Shark Testosterone of which the player can then phone Brucie for him to deliver.
The unnamed United Liberty Paper contact from GTA IV appears in the missions "Monkey Business" and "The Wrap Up".
At the Yellow Jack Inn, inside is a fridge and to the left is a wall with 4 trophy shields. The top 2 have the words 'Best Of Show 2008' and a picture of a motor bike. This refers to the release year of GTA IV and the expansion The Lost & Damned.
Niko Bellic can be the father of the Online Protagonist.
Rocco Pelosi appears in the missions "Mr. Richards" and "The Ballad of Rocco".
During the Prologue when Brad and Michael are shot, Trevor repeatedly shouts "Fuck you!" when shooting at the cops. This could be a reference to Johnny Klebitz who used a similar line in The Lost and Damned.
At the Vanilla Unicorn, there is a sticker on the lockers in the back room for Honkers Gentlemen's Club in GTA IV. These stickers can also be seen at Tattoo Parlors around San Andreas.
If you go to Sub Urban as Michael, you are able to buy a Hawaiian shirt very similar to the one Max Payne wears in Max Payne 3.
The Dignity is extremley similar, almost directly copied, to the boat present in the beginning of the mission Sun Tan Oil, Stale Margaritas and Greed in Max Payne 3.
Sometimes when Michael enters his house, he will say "Honey, I'm Home!" This is the same line spoken by Max Payne during a cutscene as he enters his home before realizing it has been attacked. Similarly, Michael also has his home and family attacked during the mission Meltdown.
Red Dead Redemption
There is a Rent-A-Car agency named "Escalera". Escalera was a town in Red Dead Redemption.
In the Grand Theft Auto Online character creation menu, it is possible to get John Marston from Red Dead Redemption as your father.
The surname "De Santa" that the FIB gave to Michael Townley and his family is a reference to Vincente De Santa, a major Red Dead Redemption antagonist.
Café Redemption is likely a reference to Red Dead Redemption.
During the mission Daddy's Little Girl, the man working at the bike rental shop in Vespucci Beach can be seen wearing a John Marston t-shirt.
In Strawberry, under the freeway, there is a lot of graffiti on the walls. One of them resembles a silhouette of John Marston riding a horse at night time, with a full moon. John is the protagonist of the game Red Dead Redemption.
There is a book case in the living room of Franklin's Vinewood Hills house, with a few titles that stand out, like the book "Red Dead", by a J. Marston. "J. Marston" could refer to John Marston's son Jack Marston, who regularly reads books and stated that he may write a book himself one day.
There are two roads in Sandy Shores referencing towns in Red Dead Redemption, Cholla Springs Avenue and Armadillo Avenue. Algonquin Boulevard, a nod to the Algonquin borough of Liberty City, cuts through both.
At the Yellow Jack Inn, inside is a fridge and to the left is a wall with 4 trophy shields. The middle shield has the words 'Best Of Show 2010' with a picture of what appears to be a Stagecoach Wheel. This refers to Red Dead Redemption and its release year.
In the Vanilla Unicorn strip club, an NPC will occasionally wear a blue jersey with the last name "Hopkins" referring to the Rockstar game Bully.
A movie can be seen advertised called Sequel II, this is a nod to a movie in Bully, Sequel: The Movie.
At Vespucci Movie Masks in Vespucci Beach, there is a pig mask which similarly resembles Piggsy from Manhunt which is also made by Rockstar. In GTA Online you can also purchase a hockey mask which resembles those worn by members of the Skins and carnival masks resembling those worn by members of the Smilies.
In the mission, The Paleto Score, on the drive to the bank, Michael mentions that his first score was a heist in the outskirts of Carcer City in 1988.
The ground based Arms Race missions - done for Oscar Guzman by Trevor - could be a nod to another Rockstar Games series called Smuggler's Run where players must pick up and drop off contraband across the map. The Dune Buggy - which these missions are completed in - is a possible reference to some of the cars used in Smuggler's Run.
The GTA Online Crate Drops are perhaps another reference to Smuggler's Run. The red smoke rising from them and the Arms Smugglers (who pick up if no one claims it) could add to this. The locations are mostly off road just like the game was mostly set off road.
The Elysian Fields Freeway in the game is a reference to the Elysian Fields Development company from L.A. Noire.
One of the TV Commercials (for Up-n-Atom Burger) shows the restaurants as they were in 1950. The footage reuses images from L.A. Noire.