Prerelease:Pokémon Snap

Pokémon Snap was originally meant for the 64DD, but was moved onto a regular N64 cartridge. In its 64DD days, there were several differences, from different landscapes to scrapped Pokémon.

IGN Video
IGN once had footage of a really early build, but it no longer does. However, someone managed to back it all up and upload it to YouTube in 2006. XUQKKSaEQM4
 * The logo is different.
 * The area is a plain with trees, nothing like anything in the final game.
 * You can only take 6 pictures.
 * You can switch between Apple, Pester Bomb and Poké Flute in the bottom right.
 * The plain area goes into a forest.
 * Ekans is present, nowhere to be seen in the final game.
 * Snorlax stands up.
 * A Pidgey is seen standing on the ground, while they only fly in the final game.
 * There is a savanna area, another area with nothing like it in the final game.
 * Pikachu seems to use a different model.
 * Meowth has a different and rather silly walk cycle.
 * The album is different.

Ekans
A closer, more clear look at Ekans.

Album
A completely different photo album.

Early Pikachu Model
A closer look at Pikachu's model. It looks different from the final, looking thinner and taller.

Ghost Level
While it may never have made it into the game, there was supposed to be a level featuring ghost types. A music track was composed for it, but was never put into the game. Ikuko Mimori, the composer, has the song | on their site.