These are a couple screenshots of glitches I found.
Note: the larger ones might take a while to load.

Abe standing on thin air. I don't remember how it happened.

Also Abe standing on thin air.

I don't remember how
this happened, either, but if you look closely, you can see that Abe is sitting on Elum backwards.

This may just be a videocard flip.

Here, this glitch was fairly easy to achieve. I went on the screen with the bomb and stayed until it flew towards Abe. Then I quickly turned him around. The bomb blew up, and when Abe and Elum came back at the last checkpoint and they went forth one screen, the elevator was missing. This was an enormous source of amusement on my part, so I was able to make it onto the top ledge in the bottom screen
with Elum.

I came into the screen and the Scrab was missing. I don't remember if there was anything peculiar about my entrance, but this has happened before in another place.
Here, I accidentally went too far into the wall on the top screen, and I fell for some reason. Abe disappeared. Then I waited to see if he would reappear again, and then the
Scrab disappeared.
And here, this happens everytime, well, almost everytime, but not like this. It's only when I roll forward into the tube and stop and the edge of the screen, the Scrab goes into the tube and kills Abe. This time, however, it was there to begin with.
This one, I remember clearly. I had been playing AO for so long now that I often become bored and do things in the untraditional way. So, instead of going through the ordeal with the bomb
first, I ran into the screen with the Slogs, jumped over one of them while the other confusedly turned on the spot, ran into the screen to the right, jumped into the well on the screen before the bird portal to ST, and, while the Slogs attempted to bite the thin air, I came back and ran to the left until I reached the other well, hurriedly jumping into it. I blew up the bomb in the usual fashion, and then the Slogs appeared out of nowhere and killed Abe.
Har har. I changed them to JPG.