- In the southwestern block of Bedford Point lies a parking lot (notably featured in the Kingdom Come mission) where an easter egg can be located; known as The Hidden Sign. To reach it, the player needs a car of small size such as Manana or Taxi. Going up the stairs leading to an overlooking platform to the north of the lot (near the entrance to an underground parking in the same area), the player must jump from the car to reach the top of a building to the west, jump down on the wall and from there drop down to an otherwise inaccessible alley behind it. At the end of the alley, on the wall, there is a posted notice that states "You weren't supposed to be able to get here you know." Near the poster is a ramp that allows the player to leave again.
- At night, shooting the moon with a sniper rifle will change the size of moon.
- Zombie Elvis Found! is an Easter Egg, that does not have a specific place, because it's a headline on newspapers found on the streets throughout Liberty City, that depicts the headline, along with a black and white photograph of Elvis' face. A clear reference to a belief by some that Elvis still lives.
- In the subway stations of Liberty City you can see posters with a background and some drawings, with the initials of the series in gray, that is GTA.
The posted notice in the alley.
A newspaper with the headline.
The ad with the letters GTA.
Various sizes of the moon.
References to previous games
- Inside of the TW@ Internet Cafe there are computers on the first floor displaying screenshots of GTA 1, and GTA 2.
The computers with screenshots of GTA 1 and GTA 2.
An advertisement for Top Down City.
References to other games
- On the in-game radio, you can sometimes hear references to Carcer City, which is a city that would be later used in Rockstar's Manhunt.
- In the mission Two-Faced Tanner the character that the player has to kill is named Tanner, protagonist of the Driver series. He was given a female walking animation due to the criticism that Tanner in Driver walked like a girl.
- In the sky, a constellation bearing resemblance to the Rockstar Games logo is visible.
- The yellow notebooks carried by male students of Liberty Campus feature scribbled drawings of urinating male genitalia.