Let's see:
Frog isn't a Prince, but does lead you to a reward if you kill the Hag
Romancing the Drow lore in the hidden waterfall area
The boar is Welsh and wants a bride
Out-of-the-blue random Illithid NPC trader (which... might be bugged. After save scumming the entire thing, getting all positives + the ring, Lae is now bugged in camp. Gonna re-run this a few times to see if it's actually related)
Harper's hidden cache is like the most super-hidden bit of treasure you'll ever find (...but bugged atm)
No idea how people are not getting all their companions to high++ levels: currently I have 5 companions who all want to jump my bones
Van Hellsing knock-off Vamp killer got squished
Myconid evil heel turn: gonna have to run that one as evil char and see what happens if I side with it
Barrels. Alllll the barrels.
Phase spiders: everyone moans about the balance, without spotting the hidden area with the Lloth lore in it.
Squirrel Mafia: it's a thing.
And so on.
It's very good so far.