Machine Hunter information:
Press Square, Triangle, Circle Square at the "Vault" screen of Disc 1.

Spawn preview:
Press Triangle, Circle, Triangle, Circle at the main menu of Disc 2.

Crash Bandicoot 2 preview:
Press Circle, Triangle, Square, Circle at the main menu of Disc 2.

Blasto preview:
Press L1 + L2 + R1 + R2 at the main menu of Disc 2.

PlayStation second birthday FMV sequence:
Press Triangle, Circle, Square at the "Event Center" screen of Disc 1.

View Helene Sheeler:
Hold Square + Circle and press Triangle(2) at the "Code Archive" screen of Disc 2.

Apollo 440 FMV sequence:
Press Triangle, Circle, Triangle(2), Square at the main menu of Disc 2.

Toggle music:
Press Start at the main menu of Disc 2.