Input these codes at the Easter Egg menu:

SUPER FOOT - Kick extra long field goals
CREDITS - View credits
OVAL OFFICE - Presidential players
ENDURANCE - Unlimited endurance
FATIGUE - Players tire faster
PENCIL - Tall thin players
EUROLEAGUE - European players
ALL BOBO - Players' last names are Bobo
989 SPORTS - Players named after 989 Sports staff
REDZONE - Increased defense
FASHION SHOW - Unknown