In the Nintendo Gallery in Forest Haven, look somewhat to the right of the sculptor. You will see the Keaton and Goron masks, and the Bunny Hood from Legend Of Zelda: Ocarina Of Time. Also, at the room where you get the Master Sword, jump into to water and look at the stained glass windows. Six of them are pictures of sages, and one of them is a picture of Ganon in his final form. They are all references to Legend Of Zelda: Ocarina Of Time.