Guns N' Roses vocalist Axl Rose is the DJ of the classic rock station K-DST. He mocks the modern/grunge rock station Radio X, despite their rotation including "Welcome to the Jungle".
Chris Penn, known for playing Nice Guy Eddie in Reservoir Dogs, plays Eddie Pulaski.
Bad Export for You: Since German politicians are extremely touchy with the subject of violence in video games, the German version of this game had to undergo some censorship. Some of the changes are only visual (people don't get mutilated by headshots anymore, for example), but there are changes that directly affect gameplay as well. Most infuriating is probably the fact that people don't drop money anymore when killed, which effectively robs the player of one source of income.
Ryder is voiced by MC Eiht (fans will recognize his "g'yeah").
Faizon Love — Big Worm from Friday — is your brother Sweet.
Samuel L. Jackson and Chris Penn play the villains, Officers Tenpenny and Pulaski respectively.
Peter Fonda is The Truth, David Cross is Zero, James Woods is Mike Toreno, Ice-T is Madd Dogg.
The DJ for the Classic Rock station (K-DST) is voiced by Axl Rose, who often takes shots at the heavy metal/grunge station Radio X. Radio X plays Welcome to the Jungle.
Chuck D of Public Enemy fame as "Forthright MC" on Playback FM and Motherfunking George Clinton himself as "The Funktopus" on Bounce FM. There are no Parliament/Funkadelic tracks in the game, but Bounce FM features a melody of many songs by the P-Funk collective, and sometimes, in the outro to "Rebel Without A Pause" Chuck D says "now Public Enemy is a group I have always been behind!" The meta here is sickening.
And Michael Bivins of New Edition and Bell Biv Devoe as the DJ of the new jack swing station CSR.
Throw It In: The random plane crashes were a glitch Rockstar discovered during beta testing, due to a spawned plane's randomly set trajectory sometimes intersecting with the ground. They found the crashes so funny and appropriate for the comedic Crapsack World setting that they left the glitch alone.
Urban Legend of Zelda: Persistent rumors had it that Bigfoot is in the woods somewhere. It is a mod, and not a very visually impressive one at that. Similar rumors, disproven, held that it's possible to find aliens wandering the desert around Area 69 and Leatherface from Texas Chainsaw Massacre around The Panopticon. Another rumor involving the woods is the odd beat-up cars found in the Back O' Beyond, dubbed the "ghost cars", due to one of them rolling down a hill upon spawning, spooking some players.
There're plenty of callbacks to this game: One of the radio stations is the HD equivalent of WCTR, the Epsilon Program led by Cris Formage. The gangs you'll come across are the Chamberlin Hills Grove Families, which is a branch of the Orange Grove Families. The Ballas, who had taken over the Grove Street cul-de-sac in the 21 years between the two games. The Los Santos Vagos and the Varrios Los Aztecas; the latter of which Cesar apparently moved on from because they're not so friendly story-wise anymore.
In one of Lamar's missions, you actually go to where CJ's house on the cul-de-sac would be. He doesn't live there anymore, most likely since GTAV takes place in a different era than SA, but the Grove Street Families are referenced here and there. Turns out that they moved to greener pastures.
CJ can be heard being talked about in random street conversations in Grove Street and the surrounding areas, as well as some dialogue between Franklin and Lamar. He apparently has reached some kind of mythical status in his old neighborhood.