At the 'Bonus' menu select the 'Cheat Codes' option and enter one of the following codes (without the quotes) to unlock the corresponding effect. Cheats are activated by displaying the 'Cheat' menu during gameplay and toggling the effect you want to enable.
Buzz can use his Laser in Story Mode Levels: Enter 'BLASER' as a password.
Old Movie Graphics: Enter 'OLDMOV' as a password.
Toy Aliens Wear 3D Glasses: Enter '3DGLAS' as a password.
Woody Wears Bandit Outfit: Enter 'BANDIT' as a password.