Pulsating Heads:
Go into Career Mode and create a new boxer. When asked to enter your
name, put in THROB and then select your Gym. You will see the boxer's
head shrink and grow repeatedly.
Unlock Mills Lane:
Go into Exhibition and fight a in match in any weight class. During
the fight, you must be disqualified by giving your opponent a kick
to the stomach three times. Do this by pressing
Triangle+Square+Circle+X simultaneously. Once the match is called,
you will be taken back to the "Exhibition" screen. Choose the
Middleweight class and scroll over until you see Mills Lane with
boxing gloves!