Despite Rockstar's official split between the 3D Universe (Vice City, San Andreas) and HD Universe (GTA IV), the apocalypse narrative in GTA IV deliberately references Marvin Trill and content from the older games—one of the few times the universes acknowledge each other.
Source: Apocalypse — CC BY-SA
Marvin Trill hosting his end-of-days radio show on West Coast Talks in San Andreas—the same conspiracy nutjob who gets name-dropped in GTA IV's apocalypse storyline, universe be damned.
Blank slate, same energy as Rockstar's 'official' universe split—rules made to be quietly broken when Marvin Trill gets his HD Universe cameo.
GTA San Andreas predicted the 'think of a random object' privacy trick decades before it became a meme.
GTA: San Andreas
Rockstar hid a farming detail so obscure most players never noticed — the harvester actually works on specific fields.
GTA: San Andreas
Rockstar knew planes were kamikaze-ing into buildings—and left it in on purpose.
GTA: San Andreas
The 'Drive Thru Confessions' booth in the woods — praying to nothing, or something listening?
GTA: San Andreas