If you Google "tvtropes ff8" then click the first thing that comes up, and click the "WMG" tab, you should be able to find it. Or click this:
Final Fantasy VIII - Television Tropes & Idioms
Here's what I can remember.
-There's a mobile island that's been out of use for a very long time, but it has signs of an old civilisation being rooted beneath it. This is in roughly the same coordinates as FF3's floating continent, stated in said game to require maintenance to remain airborne. Apparently Desch didn't get the instructions to pass down far enough.
-There was a big-ass crystal pillar somewhere in the world once in FF8. It's now encased in the Lunatic Pandora and hidden underwater, though.
-The world map layout has land covering roughly the same areas.
The other points were mostly plot-related and you can make of each of those whatever you will; I just like the geographical similarities. Obviously I don't consider any of this canon; I just think it's really cool.