Ratchet & Clank Cheats

3 Good glitches (i found)
On Orxon (the green gas planet) go keep going until you get into the lab part. Look for a platform with 4 boxes stacked in the corner and a frog. Jump on the boxes and jump over the wall next to you, you will be out of the level!

On planet Kerwan (the train level) keep going until you get to the first escalator, get to the upper side and jump on one of the platforms on either side. Now you should be able to walk into a little gap. (both sides), now wall jump off of the inner wall and hyperstrike, you will be on a higher platform, now keepwall jumping back and fourth and you will get on top of the building!