All FMV sequences:
Pause game play then hold L R and quickly press X(3), B(3), X, B, X.
All power-ups:
Pause game play then hold L R and quickly press B, X, B, X, B, X(3), B(2), X, B(3).
All warp gates:
Pause game play then hold L R and quickly press X(2), B, X(2), B, X, B(3).
Defeating the Black Knight:
Ram red switches when Black Knight moves near them.
View credits:
Pause game play then hold L R and quickly press X, B(2), X, B, X.