Thought I share this, as I was in hysterics when this happened. I stumbled across a weird yet amusing glitch, where you control Abe and a Slig synonymously. Funny stuff.
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"For I am not ashamed of the gospel, for it is the power of God for salvation to everyone who believes..." - Romans 1:16
I've never actually seen this glitch in either of the games, but that's pretty funny.
The only glitch I've come across that I can remember off the top of my head was in AE. If you quiksaved at a certain moment while possessing something and then reloaded, the possessed thing's brightness would be permanently increased. I don't think I ever pulled it off on the PC/Steam version(s) but I did it all the time on PS1.
I used to do that all the time when I was younger. I would get genuinely upset when I had to eventually stop possessing them because I thought it was so cool.