Infinite Continues:
Accumulate over 100 continues, then enter the options screen & change the 'Credit' option, to 'Free Play'.

Power-ups:
While playing a game, press Up, Up, Down, Down, Left, Right, Left, Right, X, Circle for power-ups. Note: This can only be entered once per level.

View All FMV Sequences:
On the options screen, highlight the 'Movie' selection & press Down, Up, Down, Up then hold L1 + L2 + R1 + R2 & press Start.