List of Mario Kart: Double Dash!! pre-release and unused content

These are the beta elements for Mario Kart: Double Dash!!

Early iteration
The models of the characters are from Super Smash Bros Melee, and Mario and Luigi are seen in this trailer of a very early build of the game, driving separately, each in a simple, blue kart. It was originally called Mario Kart for GameCube, and it is likely that this early build of Mario Kart: Double Dash!! was completely scrapped and redone for the final game, as it looks nothing like it.

Early builds
Several screenshots released during the development of the actual Double Dash build shows different textures, tracks, speedometer HUD, and racer pictures.

Unused data
Pressing         at the end of a trial mode race (where save ghost and replay are) will bring up a series of numbers and letters, presumably for debugging purpose. This doesn't do anything, but it is interesting to see that Nintendo forgot to take it out of the game.