These are the beta elements for Mario Kart 64
Beta Elements
Kamek was going to be in this game playable, but got replaced by Donkey Kong. Also note that the Character select screen was going to have the racer face towards the player. The working title was Super Mario Kart R. In certain gameplay screenshots, the Feather Item, which appeared in Super Mario Kart, was going to be included in the list of items of the game. Boos from Banshee Boardwalk had also a different look. The HUD was different from the final version. Item boxes were also completely black with colored question marks on them.
- Mario Kart 64 Beta 01.gif
The beta title screen of Mario Kart 64. It was named Super Mario Kart R at this point. 
Kamek would have once been playable in Mario Kart 64 and Wario looks slightly different. 
Beta screenshot 
Kamek in a race 
Beta boos - KART01.JPG
The beta start 
A beta HUD
