Alternate ending
Successfully complete the game after collecting 101 Power Cells.

Faster credits
Once the names of the Naughty Dog staff have been shown and have disappeared off the screen, hold X or Circle, The credits will speed up and be completed in a few seconds.

Hint: Faster Zoomer
Hold L1 + R1 to go faster on the Zoomer, at the expense of maneuverability.

Hint: Shoot cannons farther
To make the cannons at Misty Island and Sentinel Beach shoot farther, hold Square or Circle + X. This helps with any steel boxes.

Glitch: Walking on Sad Guys back
Go on stairs behind him and walk forward.