The giant tiki statue on the Tiki Theater in GTA San Andreas is actually modeled after the hidden package collectibles from GTA: Vice City — a subtle nod most players never notice since the building is completely inaccessible.
Source: Tiki Theater — CC BY-SA
That 'dog' in the GTA: San Andreas trailer fooled thousands of players.
GTA: San Andreas
This GTA V street was originally a secret San Andreas callback
GTA: San Andreas
This Las Venturas 'cathedral' fooled players for years — but the biggest lie was hiding in plain sight.
GTA: San Andreas
The Chupacabra in GTA San Andreas changes appearance based on where you're from.
GTA: San Andreas