In Andy's neighbourhood they all say you need jet boots to defeat RC in the race. You don't. All you have to is when he is coming up from behind, block his path to slow him down. Continue to do this as an easy and simple method of beating him.

At the title screen press X, circle, square.

Green lasers will allow enemies to be killed with a single shot. They can be found at the following locations.

Andy's House
When you go to the garage, find a way to get up to the van. When you get to the top, you will see a green laser.

Alleys and Gullies
Turn to the right when you see the first airplane box.

Andy's Neighborhood
Find your way to the location with a broken car. The green laser should be right in front of you.

When you are at the options menu, enter Right, Left, Circle, and Traingle twice. You should have all the games levels open. But you will still need to collect Pizza Planet Tokens.

When your health is gone, quickly exit the level then return to it and you should be invincible.