The Legend of Zelda: Ocarina of Time
Nintendo 64 Cameos
Lon Lon Ranch
The workers on Lon Lon Ranch, Talon and Ingo, are based on Mario and Luigi. The colours of Ingo's overalls seem to be based on Luigi's overalls from Super Mario Bros.
Talon's daughter, Malon, also seems to resemble Princess Peach in some ways, such as her hairstyle. If you look closely at Malon and Talon, you can see that they are wearing brooches featuring the face of Bowser, the villain from the Mario series.
Submitted by Fryguy64, TV Eye
Mario Pictures
When you enter Hyrule Castle's garden, look through the windows on the right-hand side. You can see pictures of characters from the Super Mario series: Mario, Yoshi, Peach and Bowser.
Submitted by Fryguy64
Eternal Star Sign from Super Mario 64
In Dodongo's Cavern, climb up to the second floor and look out over the main entrance. There is a sign here written on a stone tablet rather than a wooden signpost. This tablet was first seen under the star-shaped fountain in Peach's garden in Super Mario 64. It reads "Eternal Star".
Due to the low quality of textures on the Nintendo 64, the sign became the subject of rumours that it actually read "L is Real Star 2041" and was part of a method to unlock Luigi.
Submitted by Fryguy64
Stone of Agony
The Stone of Agony is shaped like the Nintendo 64 Rumble Pak. Once you have it, you can detect nearby secret holes in the ground if you have a Rumble Pak connected.
Submitted by Da Robot
Beta: Arwing From Star Fox
While not available through normal gameplay, an Arwing from Star Fox was programmed into the game as an enemy. It has so far only been unlocked using hacking.
The Arwing flies around shooting lasers at Link. If hit with a weapon, it spins around and crashes into the ground, causing a damaging explosion.
Submitted by mopinks, Boo Destroyer