I have been on many websites featuring Twilight Princess Easter Eggs and I have not found one yet which contains the following Easter egg, so here goes:

When you are first a wolf and when you go to visit zelda check the back of the cloak she wears (near the neck of the cloak). If you look carefully you can see the Sheikah eye from Ocarina of time. This is, what i think, proof to what smashbros.com says about Shiek's suggestion of being on TP.

Tip: There are a few scenes showing the back of the cloak while Zelda is talking to midna. It is best to see Shieks eye then. It is in fine grey-white so look carefully.;)

Good look searching for this trace of evidence, Dragozan