# To find the Jeweled Sword of Major Damage in the Reaper's lair in the Britannian Sewers, you must Look at the oversized plant until your Search skill reveals it. For those fighting with swords, this will be THE weapon of choice for most of the game.
# If you can reach the ghost in the Britannian Sewers, you get a chain cowl of Valor. This cowl is more useful than it looks, because according to the Cluebook, Valor "adds +10 (plus one per 5 points of your casting skill) to your weapon skill". How awesome is that?
# There's a new form of hallucination, one that makes only some pixels glow really bright. It's like you're tripping into the ultraviolet!
# Alcoholics rejoice! When drinking booze, if the text says "The drink makes you feel a little better for now", then you've healed 2 hit points! Never been a better excuse to get shit-faced plastered than this.
# Speaking of hallucinations, getting the 'almost blind' hallucination while in the Ice Caverns is one of the most awesome colour displays you'll ever see.
# While You do NOT have to kill Sentinel 868 in the Ice Caverns to get through the door behind him, that is only because the 'Open' spell works on the door. However, playing a pacifist game with minimal kills will more likely than not leave the Avatar XP-starved, and therefore unable to cast the spell until much later in the game. Not to mention that getting the Ex rune is not as easy as it sounds.
# In fact, I managed to get through the door without Sentinel 868 turning hostile. Talk to him and immediately choose the "I will go now" dialogue choice, which end the conversation without violence. Cast 'Open' on the door, and the golem will only be upset when you open it and go through.
# While doing this, I discovered that critters that force you into conversations almost only do so if you are looking at them. If you're avoiding looking at them, you can get REALLY close to them without them doing anything. This could be useful for exploitation purposes at some point. One of the ways to make them trigger conversations is if you moonwalk into their face.
# One other thing regarding the Ice Golem - Beatrice states that the city-state of Anudunos was crushed when the Guardian froze the entire continent. Meaning that it was not a cold near-arctic terrain to begin with. And if Sentinel 868 is the last remnant of Anudunos' former glory, when why have an ANIMATED ANTHROPOMORPHIC BLOCK OF ICE standing guard in an environment that's clearly not suited for ice?
# One of the traps I encountered in Anudunos was called 'Change Terrain' - I'm guessing that it changes the wall behind the door, so that it appears that there's really nothing behind the door. But if you Search the left-hand wall, a button will be revealed down by the floor, revealing a room with a Mace of Major Damage, a broadsword of Poison Weapon and a tower shield.
# You HAVE to kill the Bliy Skup Ductosnore, but only for the purpose of reaching the Ductosnore chamber to use Altara's Rod. As for the Ductosnore chamber... you don't have to follow the instructions to the letter. I switched the two storage gems, and still a new Bliy Skup Ductosnore was spawned, and still both Historian and Futurian thanked me for saving their people. So while they're free of the Guardian, I may have doomed them to a whole new fate altogether...
# On the conveyor belt on Talorus, there are tons of leather boots. One of the pair is 'worn' instead of 'servicable', and this pair are magical boots of Bounce. Wearing them is as hilarious as one can expect...
# Speaking of the conveyor belt, at the top end of it is an unblemished sceptre of Shockwave. You'll need Telekinesis to get it, though.
# The unnamed goblin in the Britannian sewers is not to be overlooked. He's the Tracking trainer for the game, a fact that not many sources seem to be aware of. Even the dialogue option that reveals it is not so obvious. What's more, if you kill all the Bloodworms on the beach around the large lake northeast of his position, he'll reward you with a fresh fish and bestow the title of 'Wormslayer' upon you.
# More than that, check back with the goblins once you're near the end of the game. They'll give you a blackrock serpent. It serves no purpose in Ultima Underworld 2, but will be part of your starting equipment in Ultima 7, Part 2: The Serpent Isle.