In Gulp's Overlook shoot gulp with whatever (super breath weapons) and run to the ledge and when he hits the floor jump when he dose that and try to glide to where ripto is. Jump of the ledge behond ripto and fly under the arena after a few seconds spyro will apear back on the arena where gulp is

Heres a random one that i dont know how i did:

After i defeated crush i went to eat then when i came back i decided to go for a swim but when i jumped in the water spyro fell threw and was kinda stuck XD
similur to what happend in spyro 3 where i jumped in the lake at evening lake and fell to the floor and go stuck because spyro was still walking not swiming x_x

ok, here's a glitch, but it's a bit hard to pull off:

1. go to Crush's Dungeon.
2. get Sparx either blue or green.
3. defeat Crush.
4. RIGHT when the rocks start falling on him for the final time, glide over the lava until the game disables your moving ability. then, Spyro will get burned to death by the lava.

you will have done something similar to the "lava trick" in Spyro 3. you'll appear in Autumn Plains without Sparx and you can't press the Start button. if this happens, you now can walk in any water, even Speedway water, along with a few other minor things.

BUT, things to remember:
1. it does freeze after some cutscenes, like the cutscene where the machine activates (the one with the purple guys) in Hurricos, and the water filling up in Aquaria Towers.
2. the START button doesn't work when you do this.

Another glitch I found was in (aaargh!! I just forgot the name - no, I got it...) Fracture Hills that can make single earthshapers invicible:
Push an earthshaper to the the doorstep of the alchemist's house, sneak past the eartshaper and talk to the alchemist. Answear no. The eartshaper will jump back to where you found it. Step close to it, and it disappaer, but can still hit you.

My finds:

Summer Forest - Go to the penultimat base where you have to jump, following learning to Glide, jump and hover from Hunter. Turn around, facing the hills. Jump and glide, and you'll go through them, turn left and youll see the little river, where the underwater passage is. Glide into it, and youll be just walking in the water, not swimming. WARNING - YOU CANT GET OUT UNLESS YOU RESTART YOUR SAVED GAME FILE.