Contrary to some reports, The Legend of Zelda: Ocarina of Time 3D isn't crammed full of Easter eggs based on the upcoming Skyward Sword.
After a lot of searching both online and in-game so far I’ve found only three, all of which are official art of Link. I’ve also found two relating to Majora’s Mask but for brevity’s sake I’ll save them until my next blog post. None of these are particularly amazing but interesting to see nonetheless.
Here’s where you can find them. Spoilers, I guess.
Let’s start with the easiest one. Head to the bedroom at Lon Lon Ranch as adult Link and look for the two pots placed between two cupboards. Smash them and you’ll find this leaning against one of the cupboards.
I’m not sure if this was present in the original game but if you head to the same spot as young Link you’ll find this sketch on the wall, presumably scribbled by little Malon. Dawwww!
Credit this next one to me since I haven’t seen anyone else report on it yet. Head to the bomb shop in the back alleys of Hyrule Castle Town. You’ll need to be in the young Link time period and it has to be night time. Go to look at the left shelf of wares and the camera will swing left just enough to see another picture of Link on the wall.
The last of the three is tucked away in an optional chamber in the Gerudos’ Thieves Hideout. It serves as a one way connection to the room the Gerudos dump you if you get caught in the stealth sequence.
The quickest way to get there is from the aforementioned room you get dropped into. Hookshot up to the window ledge like you’d normally do to escape. Look down and to the left and you should see the first floor entrance. If you angle it right you can simply jump down there. Use the hover boots if you’re not confident in your jumping abilities.
There’s only one main room here so you shouldn’t be able to miss this; smash to two crates against the wall to find to find your reward. Just make sure you either have the Gerudo’s pass or take out the guards before you attempt this.