I know a very good glitch that only works in certain places on the game on Abe's Oddysee. You can go through walls with this, but only walls that are on the left side (so only walls on the left, not the right although I havent really tested this out on that side and I dont know if this works for the PC version).
Firstly, get 5 steps away from the wall you want to try to go through. Make sure there are no ledges against the wall that you could grab onto.
Secondly, runjump at the wall and immediately start chanting as soon as you land(you might wanna hold in L2 and L1 as soon as you runjump). You should be slightly in the wall now.
Finally, jump up. If this worked, abe should jump up and sorta slip to the left of the wall and be through it.
If this confused any of you, I will soon post a video of what I mean because that looks hard too understand.
I know many places of where this will work and one of them is in the Stockyard Escape level, where you go into the first secret.
Once you go through the door, go all the way too the end of the path leading too the bird portal but don't go through it, just go right too the end. You should be by the wall.
Count 5 steps away from it, do a runjump and instantly start chanting as you land. Then, jump up. You should go through the wall. Now, if you go too the left even further, you should be on the background of the screen with the lights that light up when you chant (with the scrab in that pit). If you walk one more step, you will fall and go off the screen and a few seconds later the scrab will dissapear. And then you will have to restart your game
.
I haven't tested this on the PC version so I do not know if it works. If all this is too confusing or you can't be bothered too read it, just PM me and I will try too upload a video as quickly as possible. Enjoy, if you can understand it anyway!
EDIT: I tryed it on the PC version and it worked. And I also tried it on Exoddus and it worked too! I used the demo and no -ddcheat, but the glitch used above! Here are 3 screenies:
^^ Try it out on the real version on any wall too the left! Enjoy!