Note:-  This cheat is also known as Madden 2002

Get old-time players without madden cards:
Go to create-a-player- menu and type in an oldtime players name EXAMPLE:

Dan Marino

and when you are done with that make the attributes as you like
Sent in by Absolutelyclems

Dancing into the endzone:
Press L or R before running into the endzone and your player may do a dance. Note: He must be wide open.

Another way to dance into the endzone with two different dances is to hold Z + L or R.

Unlimited creation points:

Create a player. 
Then go to Edit Player at the roster screen. Press Up or Down to choose the player you want to edit. Press Right to get to the speed category. Choose attributes to adjust them up to 99 points. 

Easter Egg (thanksgiving):

If your Gamecube clock is set to Thanksgiving day, Madden and Summerall will refer to it in their commentary.