Increase Smackdown Meter:
     Quickly  press  the  taunt button during a match (this will leave
you open to attack). Your meter will fill to its full level.

All Wrestlers:
     At the main menu: Press Up(2), Down(2), Left, Right, Left, Right,
Triangle(2), Square.

Open Wrestlers: 

Captain Lou Albano:
     Successfully  complete career mode with a wrestler in the "Hated"
category.

David and Michael Von Erich:
     Successfully complete career mode as Kevin Von Erich.

Dory Funk:
     Successfully complete career mode as Terry Funk.

Fritz Von Erich:
     Successfully complete career mode as Kerry Von Erich.

Ivan Koloff:
     Win the versus tournament.

Jimmy Hart:
     Successfully  complete career mode with a wrestler in the "Loved"
category.

     King Kong Bundy:
Win the Southeast Territory in career mode. 

Mr. Fuji:
     Win the Tag Belts in tournament mode.

Robert Gibson and Ricky Morton:
     Win the tag tournament.

Sabu:
     Successfully complete career mode as The Sheik.

Real names:
     When  creating a wrestler, you can make people such as Ric Flair,
Hall, Nash and others and the announcer will actually say their names.