I don't think the Feeco thing is really a true glitch, it's just possible using invincibility to get the programming to do that. If teh doors didn't shut for Slig Barrakcs or Bonewerks, then you would be able to do it multiple times by deactivating the electric fields, but normally you can't. So no special reinforcing codes were put in to specifically prevent this glitch. As I said, a side effect.
There's plent of glitches available. One good one is getting things stuck behind walls. For instance, possess the Slig at the beggining of the Paramonion temple in AO, then pull the lever to lower the pulley. Tell the Slog to "git 'im" if you said "here boy" and it will run of the edge (if there's no enemies around for the Slog to attack, it runs a few steps forward anyway). Pull the lever again the bring the pulley back, and when you go down, the Slog will be one the other side of the wall. You canh't even shoot it. You may be able to get it to run off to the left, whence it will disappear. I got Abe and Elum stuck like this once, and had to reset it. If this happens on AO, save it first so that you will start at the beggining of the path when you reload the game. If (I don't know if you can) this happens in AE, just restart path.
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