Enter the following codes at the option menu:
Big Head,Hands,Feet:R2,R2,R2,R2,R2,R2,R2,R1,SELECT
Big Head:R1,R1,R1,R1,R1,R1,R1,R2,SELECT
Voodo Growing Head:L1,L1,L1,L1,L1,L1,L1,L2,SELECT
All 24 Rings:L1,L2,R1,R2,L1,L2,R1,R2,SELECT

YMCA:
While fighting at the Disco ring press L2.

Easy win:
While fighting at the Disco ring, throw your opponet outside the ring and keep pressing L2, until the time runs out.

Help is on the way:
While fighting at any ring press SELECT for computer assistance, a wrestler will come out and help beat up your opponent.