The Legend of Zelda: Phantom Hourglass
Nintendo DS Cameos
Dee Ess Island
In the South East Sea is an uncharted island made of stone named Dee Ess Island, and it's shaped like an open Nintendo DS.
Submitted by Teisama
Animal Crossing
When you first meet the Postman, he asks you not to shoot him out of the sky with a slingshot. This is a reference to Animal Crossing: Wild World, where you had to shoot Pete the Postman out of the sky with a slingshot.
Submitted by TV Eye
Tingle Poster
In Mercay Tavern, there is a poster on the wall of Tingle, a strange character from other The Legend of Zelda games who does not appear elsewhere in this game.
Submitted by Johans Nidorino
Shell Spinner
The Shell Spinner enemy is a turtle creature that has to be flipped over using the Hammer in order to attack its soft belly. While it is based on the Terrorpins from earlier Zelda games, the Shell Spinner's shell strongly resembles those of Koopa Troopas from the Super Mario series.
Submitted by TV Eye
Sea Slate
The Sea Slate item, used to transport yourself to different locations, resembles a Game Boy Advance game pak.
Submitted by Da Robot, Johans Nidorino