Same Player GlitchEdit
Player 1 chooses a character who they both want to be (let's say Mario). Then player 1 deselects Mario and player 2 chooses Mario. Then player 2 deselects Mario and goes back one screen. Then go to the character selection screen and you will both be Mario.
After you have done the same player glitch, this glitch will happen. When player 2 changes karts or bikes, player 1's character will change position as if he was riding the same vehicle as player 2.
After you done the same player glitch, and you finished a race, this glitch will happen. After the first race, when you go to the course selection screen, player 2 won't have a vehicle. But when you go to the next race, player 2 WILL have a kart.