All I remember from vanilla was a floating toilet on the old SA server that lagged to almighty forget, a few emotes here and there, some houses...
I remember finding floating weapons outside the bedroom map in single player, right off of the roof-top, which were slightly disapointing and slightly strange as to why the hell they were put up there. I also remember trying in vain to secure builds top-bottom so annoying forgets wouldn't wreck them in online play. I also remember attempting a ship but I barely got 3 stacks of bricks down for the haul and the game was completely unplayable.
Then I remember giving up and replaying starcraft, yeah that was good.