Glitch allows access to prologue environment in online mode
If you've played Grand Theft Auto V, you'll remember the game's prologue begins with a heist in the wintry local of North Yankton. As it's just an introductory area and not part of the San Andreas region, it shouldn't be available in the game's online multiplayer mode.
But it can be! Provided you follow this (slightly convoluted) method in this video from CVG, you can revisit North Yankton with your friends in Grand Theft Auto Online. Pretty cool, and possibly a limited-time offer if for some reason a future patch prevents it.