Buddy Cheque:
Enter the name "Buddy Cheque" at Custom player.
Thor Herring:
Enter the name "Lemon Boy" at Custom player.
Beverly Backstop:
Enter the name "Beverly Backstop" at Custom player.
Unlimited Speed Power-up:
When a speed power-up appears, collect it, then get that player thrown in the penalty box. When they get out, they'll have the power-up for the rest of the game!