The Legend of Zelda games have had plenty of Easter Eggs from the Goron Mask in Wind Waker to the nod to Mario in a Link to the Past. Skyward Sword, though, really takes references from the series' past to the next level. As it is the 25th anniversary of the Legend of Zelda, Skyward Sword celebrates this with tons of Easter eggs. Of course, there are plenty of other surprises that are just weird and silly like the field of kitties and what happens in the final battle with Demise.
Here are my favorite Easter eggs in Skyward Sword.
Btw, I'm now on my second play through of the game. I'm doing Hero Mode and I'm still hopelessly addicted to it. I love when it's a "Zelda year"!