Legend of Zelda: Twilight Princess Easter Egg - Fire Flower/Red Lion

After completeing the Temple in Death Mountain and returning to the entrance where Gor Coron is, go directly behind him and shift to first person, you can see a design on his back that looks identical to Mario's Fire Flower.

There's another Goron here (second to his left, with his legs crossed) who has a design on his back that looks like a lion, possibly Wind Waker's "King of Red Lions."