Rodney makes jokes:
When you destroy a bad robot, sometimes Rodney will make jokes.

Butt burning Rodney:
If you slide many times with Rodney, his butt will burn. This will not reduce 
Rodney's health.

Defeating the Sewer Bot in Sewer Showdown:
When you fight the Sewer Bot, he uses two attacks. He hits a cannon and fires one 
or two sewer water balls; and fires one or two robot dogs from a separate cannon. 
After the Sewer Bot has shot from all, or a few cannons, he will have to reactivate 
them. However, Rodney's cannons reactivate automatically after awhile. When the 
sewer bot is running to a cannon to shoot it, hit the cannon facing that cannon and 
hit it a few seconds earlier. Othwerwise, he will move away to another cannon if 
you shoot it too late, and he will not have gotten there yet and the sewer water 
ball will hit the ground. Time it correctly for him to get hit. He will usually fire a few 
robot dogs over to destroy you if you hit him. Keep hitting him the same way a 
few more times and he should be defeated.

Half Pipe Holes:
On the "Half Pipe" section when you are rolling around, you may fly over the holes 
in the side by going as fast as you can reach, and the jump over the side with the 
hole.

Rodney's Dad Gives Scrap in Rivet Town:
On the very first level, after you have grown up, go to where Rodney's dad is 
located. Once you are there in the diner room where he is found, he asks you to 
hold L1 and select the Scrap Launcher. Select it, but do not shoot targets yet. 
Instead, shoot everywhere else, but not at the targets. Use up all your scrap, and 
Rodney's dad will give you 10 extra scrap.

Rivet Town: Rodney's dad gives scrap: 
On the first level, after you have grown up, go to where Rodney's dad is located. 
Once you are in the diner in the room where he is found, he asks you to hold L1 
and select the Scrap Launcher. Select it, but do not shoot targets yet. Instead, 
shoot everywhere else, but not at the targets. Use up all your scrap, and Rodney's 
dad will give you 10 extra scrap.

Defeating Ratchet's robots:
When you get to Ratchet's huge robots with big blue eyes, try to destroy as many 
of them as you can. Wait until one of the robots' eyes open up and turn blue. 
Shoot the blue eye before it closes back up with one shot. The next part is much 
more difficult. You must battle Ratchet on top of his machines. Be careful -- he can 
do three moves: order his robots to attack you, throw a bomb at you (which you 
can shoot to destroy), and jump from one robot to another. When he stops on a 
robot, shoot him quickly. Do this process a few more times and he will be 
defeated.