I know for a fact they responded in a certain way to "You suck."*If you speak to a non-human species (such as Orcs), you'll often get responses like "Glugbugzugboog!" Occasionally, however, they'll respond with "Me jabber incomprehensibly!" or the like. They know words like "Ultima" and "game," and will be offended if you say certain things to them.
*If you charter a ship, have a conversation with the tillerman. He has some great stories, including ne about a lass who braided fox tails into her hair.
I don't even think I've seen council members here, but I do think they exist in the RunUO NPC database.*Magincia Council Members often carry magic items
*If you cast the Paralyze spell on a corpser, the corpser will start to move, and will follow you until hit in combat
*If you click repeatedly on a standing cow while in Peace mode, you'll see a demonstration of tge ancient Texas adolescent recreational activity known as "cow tipping" If you repeatedly click a boar, eventually the boar will turn its back to you and sit down.
*Goats will occasionally eat items left in bags on the ground, or even items in a corpse's pack
*If you drink a healing potion while polymorphed, you may transform into a creature not otherwise available to that spell. Apparently these magics do not mesh well together.
*Give any magic item to one of the staff of the Magincia's Magic (the mage shop), and they will usually give you either kindling, a deck of tarot cards or a rune to the Trinsic Mage shop in return. (However their stock of trade items can become temporarily exhausted)
Just some interesting items to add to the Era-accuracy.