A few rules questions

[kwiqsilver]

I read a post that implied Sneak Attack damage doubles on a critical. On p. 308, it says "dice for your weapon", so I would think SA damage does not double. But I don't see anything that explicitly excludes SA damage, like in PF1. Is my assumption correct?

In PF 1, there were clear rules on analyzing a monster (e.g. dragons were Arcana, giants were Nature, DC = 10+CR, etc.). Are there any rules on which skills cover which monsters and what the DC is? For the DC, I figured I could use the monster's level on table 10-2 p. 337, and use the rarity to determine the difficulty. But I'm not certain how to decide which skill to use. With Knowledge: Planes gone, is demonology part of Arcana, Occult, Religion, all three?

The exploration tactics (p. 316) imply that defending, searching, and sneaking are mutually exclusive. Does this mean a Rogue can't sneak and search? Or that a Fighter can't keep his guard up while looking for an ambush? Or that a Ranger can't sneak, search, and keep an arrow nocked?

Also, I read a post that said the trained in unarmored mistake will be in the errata. Have they published errata for the playtest yet? I haven't been able to find it.

[Micheal Smith]

Yes it does. I actually got to playtest this before the book was released. One of the developers confirmed this. When the gf had a critical the developer said role double sneak attack.

[DM Livgin]

The can't sneak and search for traps is a hard sell to the players. Maybe I'll explain that if you are flashing the lantern around and tapping on floor tiles, it isn't very sneaky?

[kwiqsilver]

I reread Searching (p. 317), and I think I was conflating it with Seek (p. 308). Searching does require more focus and physical interaction, so I can see it being impossible to do well while Sneaking or Defending (without something like a Master+ skill feat).