Cameos
Snake Whip
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One of the new weapons Link collects in this game is the Snake Whip, which he can use to grapple across gaps.
In an interview in Issue 91 of British videogame magazine GamesTM, the game's developer Eiji Aonuma confirmed that the Snake Whip was inspired by the Rope Snake from Mother 3.
Tingle Statue
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In the Hyrule Castle Town shop and in Linebeck III's Trading Shop, you can see a statue of Tingle, a bizarre character from The Legend of Zelda series who doesn't otherwise appear in the game.