All Warp Gates
Pause the game, then hold L + R and quickly press B, B, X, B, B, X, B, X, X, X.
100% success rate. 

All Power-Ups
Pause the game, then hold L + R and quickly press X, B, X, B, X, B, B, B, X, X, B, X, X, X.
0% success rate. 

All FMV Sequences
Pause the game, then hold L + R and quickly press B, B, B, X, X, X, B, X, B.
0% success rate. 

View Credits
Pause the game, then hold L + R and quickly press B, X, X, B, X, B.

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