I can hopefully answer a few of these, not sure on some others.
- How do double doors work?
We normally just put a single door token on them and treat them like a single door. I'm fairly sure it's just an art thing and double doors on the map are just there for looks, but operate like a normal door. There's certainly nothing in the manual that treats them differently.
I was already thinking about using 1 door token for next time. As you stated there is nothing in the rulebook about that. As we played it one was open and the other barricaded so that is why this question popped up.
- If a weapon attacks twice will 1 insanity for adding a chaos die be enough for both attacks?
No - the rulebook states:
"Use 1 Insanity during your turn to add the Chaos Die to your next Attack Roll."
Each weapon attack is a seperate roll, so you must use a second insanity to add the dice to the second roll.
Must have overlooked this piece of text, or just glanced it.
-How does the faceless work? He has no action points so that means he cannot move?
As stated already, sometimes a card comes up that gives monsters +1 movement, so he can move then.
Also - he has a range 3 attack, so he can be fairly annoying if he spawns in the wrong place....
The faceless can be annoying if spawned in the wrong spot but due to his static position not to bad if he spawned on the other side of the board.
-Do you discard a memory card when it is used or can it still be used to trade them for a basic skill card? Do you discard a bad memories card or can you also trade 2 of these for a basic skill card?
There are some memory cards that you will discard when you use them. They will state this specifically on the card.
Normally, you keep memory cards (even bad ones) until such a time that you want to trade them in for a basic skill card. If you have not used discardable memories, you can also trade these in for a basic skill card.