Bonus teams:
Go to the Team Selection screen,press Circle for all Super-Bowl teams, press Circle twice for all All-Star teams.

Cheat Codes:
Go to the Options screen, then to the "Easter Eggs" screen, then Enter Cheat:
Effect: Code

All Bobo teams: ALL_BOBO
Better defenseline: LINE_BUSTER
Better running back: SUPER_FOOT
Big players: TINY
Cheerleaders pictures after game: FASHION_SHOW
Floating players: POP_WARNER
GameDay stadium: GRUDGE_MATCH
High endurance: ENDURANCE
Big football: BIG_PIG
Players named after 989 Sports programmers: 989_SPORTS
Players named after European league stars: EURO_LEAGUE
Players named after NBA stars: BASKETBALL
Players named after Redzone programmers: RED_ZONE
Players named after U.S. Presidents: OVAL_OFFICE
Reduce fatigue: FATIGUE
Tall and skinny Players: PENCILS
credits: CREDITS