Create a Player with Full Power

Use the name of one of the programmers at the create player screen. It will asks you if you want the real ratings, you say "Yes". 

Passwords

Huge players
BIGBIG

Give them big heads
BRAINY

Play against England, you will get a penalty for scoring
GIPTEA

You get the teams third jersey if they have one
3RD

All players are small
NHLKIDS

Small players with regular heads and large goalies with huge heads
PLAYTIME

Stanley Cup video
STANLEY

EA Blades team
EAEAO

Game developers are free agents
FREEEA