More points:
At the Main Menu, press C-Left, C-Left, C-Right, C-Right, C-Left, C-Left, C-Right, C-Right, R, R.

Big Players:
Enter the name grEEn jeLLo at the 'Create Player' screen.

Extra Teams:
At the Team Selection Screen, quickly press C-Up, L, C-Left. You'll hear a sound to confirm entry.

Thanks to Revolution readers Hubert, Joe Weirather, and Sean Garrett!