Here are some glitches I found on the skater ranch and a secret place at Vanspark the secert place is in a set of white doors to get in there sticker Slap it and when your in spinertrasfer on to a sink.
The glitches I found at the Skater ranch are walk through a pice of metal near the wreck of houses and Anouther one is you get stuck in a wall.
First find the swamp part of the skate Park and you will see a white wall run up the wall and face the park hang down Straight and you will be stuck in the wall to get out pull your self up.
Some missions you will need to bert slide frome one set of cones to another. In order to cheat on these missions you have to start going down holding l and a. Then when you are just about to hit the finish tilt the left thumb stick to the ridght or left.