The game that reigns supreme for references to other things is World of Warcraft. When fishing, you can catch all sorts of things including an item called "The One Ring." If you go into the dead city jail, there is a torturer who keeps turning this one guy into a sheep and then "poking it until it explodes," a reference to the other Warcrafts. The list goes on.

But yes, Nintendo is very good at doing those. I remember thinking of some other one earlier, but I forget now.