Cameos in The Legend of Zelda

Nintendo enjoys cameo appearances and inside jokes. Here's a list of those that appear in Zelda games.

A Link to the Past

Tarin is loosely based on Mario. They both love mushrooms, can turn into raccoons, and look similar
The chicken guy from the mountains looks like Luigi
The picture you give Mr. Write is a picture of Princess Peach
Mr. Write is based on Dr. Wright from Sim City.
- The music in his house is a remix of the Sim City theme.
If you wait for the music to loop around in Richard's Villa, a new song will start to play. This is Totaka's Song and appears in several other games.
Mamu the frog is Wart from Super Mario Bros. 2. Mamu is Wart's Japanese name.
The Yoshi Doll is one of the items in the trade relay.
Madam Meowmeow has some pet Chain Chomps
Richard, the charater who lives at the villa, is the hero's rival from Kaeru no Tameni Kane ha Naru. The villa's music is a remix of the Kaeru overworld theme and the frogs are from the game too.
Many enemies from the Mario series make an appearance, including Blooper, Boo, Cheep-Cheep, Goomba, Piranha Plant, Pokey, and Shy Guy.
In Eagle's Tower, there's an enemy called Anti-Kirby. It looks and behaves exactly like Kirby.

Talon and Ingo are loosely based on Mario and Luigi, respectively.
Malon and Talon wear Bowser-shaped pendants when you first meet them before you go to Hyrule Castle.
In the Hyrule Castle garden, if you look at the windows at the right, you'll see framed portraits of Mario, Peach, Yoshi, and Bowser.
On the second floor of Dodongo's Cavern, there's a sign carved out of stone. The sign looks like the one under the Stone Star in Peach's garden in Super Mario 64. It most likely says "Eternal Star".
The Keaton Mask resembles Pikachu.

The Happy Mask Salesman's masks resemble several things, some of which are a mask of Mario, a mask that bears the same face of the Mirror Shield of Majora's Mask, and a Doctor Doom mask.
Mr. Barten is loosely based on Mario like Talon but Mr. Barten is much more melancholy and somber than his Hyrulean counterpart.
Head to the spot in the Astral Observatory, where the Scarecrow is. Break the pots nearby, and they will reveal a rough drawing of a dolphin. This is a reference to the GameCube's codename, "The Dolphin".