Ok, when i was going trough all my GTA games, I thought what easter eggs I like the most through the GTA Saga.
I had a few listed down, But post more so everyone can see your favorite
Game: GTA IV
The original "Claud Speed" outfit from GTA III
Game: GTA SA
The sign on the on the Gant Bridge "There are no easter eggs up here, Go away"
Game: GTA VC
The Malibu dancers on the stage look like the Village People
There are many, many, MANY more than that but those are my favs.