A few lists of clarifications. Let's try to add them into this wiki.
https://www.boardgamegeek.com/thread/1946886/rules-clarifications-master-list
1) Use Silverhelm instead of Avania in your first game. Avania comes from "Total Eclipse of the Sun".
2) If you end your turn in the dungeon and stay there for the following turn, you start in the same room (rather than the wilderness). You can therefore attack the new monster in the room you were in with no light requirements and without triggering alerts based on entering the room.
3) In the village you can only buy the top hero of each stack, rather than searching the deck in the way you do for levelling up.
4) Rod of teleportation ignores light requirements as well as effects triggered by entering a room.
5) You must attempt to fight the monster in the room your are in at the end of your dungeon movement phase.
6) Wielding two short swords allows you to draw two cards, because card abilities can be done in any order in the same phase as wielding weapons.
7) You cannot choose to drop a weapon. You cannot pick up a weapon that has been dropped after dungeon movement.
8) If you draw a treasure card which allows you to level up a hero and you cannot then the treasure is worthless. [I played this as setting the card aside and using it on a future turn, and might continue to do so since this otherwise has the potential to be unfair against a player who's behind on points.]
9) If monster decks run out replace level 1 with level 2, level 2 with level 3, and level 3 with level 2.
10) Heroes in the treasure deck cannot be levelled up.
11) Pylorian's +level ability is that she acts as a higher level for certain effects, such as Magic Missile.
12) You can buy a treasure (for 10) in the Shop of Arcane Wonders, even if you haven't bought another card.
13) If you buy a potion token from the Bazaar you may use it immediately. [I didn't spot this exception to the standard rules about order].
14) "If a monster flips over that has an immediate effect on Champions in a room, it affects everyone in that room."
15) You can only fight one monster per turn, even if you move into a different room after your fight.
16) Heroes without a physical attack can still wield physical weapons (which therefore boost from their base of zero).
Clarified: Incorrect 17) Each gold coin can only be spent once during a turn. However, if more cards with gold are drawn during the turn then that can be added to the total available. Losing a card such, as the dagger, does not reduce your total if you have the opportunity to spend further money after its loss.
18) The guardian is "just" a monster in the wilderness. Apart from the bonus draw six keep two on your final turn, all other rules about what you can do during a turn apply.
19) If you have a Stormland mirror on your final turn you can take an extra normal turn and use this to fight the guardian a second time -- but without the benefit of the extra cards.
20) When you draw an extra six cards for the final turn, you can discard any four cards from your entire hand.
21) If you ended your previous turn in the dungeon and want to take your present turn in the village, you can "teleport" there directly. This is not considered movement and therefore has no requirements or penalties.