Wild John mode:
Press Up, Down, Right, Up, Down, Right, Up, Triangle at the title screen.

Queen fairy mode:
Press Left, Right, Left, Down(2), Right(2), Triangle at the title screen.

64/74 Shiki mode:
Press Up(2), Down(2), Right, Left, Right, Triangle at the title screen.

Atlancer mode:
Press Left, Right(2), Down, Left(2), Right, Triangle at the title screen.

Star Geppy X:
Press Down, Left(2), Down(2), Right(2), Triangle at the title screen.

View FMV sequences:
Press Down(2), Left, Down(2), Left, Down, Triangle at the title screen.