By using the Wayback Machine, I was able to find a lot of interesting things on TV Tropes from before I started reading.
Like, for example, how when the site was new, there was a page in Darth Wiki to complain about shows you don’t like. It was quickly scrapped. Or how certain tropes that are definition-only for flame bait reasons, like Idiot Plot, used to have examples before they became too controversial. I think I’m going to use the site more to check out TV Tropes’ past.
The good news is that I did find the Moral Event Horizon page for South Park. It’s right here.
The bad news is I couldn’t find the others. An Aesop for South Park seemingly wasn’t archived, and the Toy Story Surprisingly Realistic Outcome has one capture, but that’s an archive of the page after being cut.