I really have no idea - perhaps you should ask Corey.
(In the menu at the top of the page [more] -> [customer service] -> [rules questions]

And if you receive a response, please post it here, as that information could help a lot of us here.

That is not dead wich can eternal lie
and with strange aeons even death may die.

I have not seen any official errate for the silver tablet. It's generally viewed as the worst scenario, though. It's just usually advised to play another one.

Here are some things I do to reduce the fiddly pieces needed, and speed play, if desired:
1) Remove the monster’s oversized base. Put them on a regular base and let the referee use the tokens for reference.
2) Remove all the damage markers except the 1’s and 5’s
3) Remove the stun tokens: turn miniatures on their side to represent stunning
4) Remove the darkness tokens: leave the card that caused darkness in the room.
5) Remove the threat tokens: use horror tokens instead
6) Remove the time tokens: use damage tokens instead
7) Remove the sample tokens: use a horror token instead
8) Remove the story choice markers: either use all A (or all B), or write it down
9) Give each player a 10 side die.
10) Separate the puzzles into clearly labeled zip-lock bags
11) Remove most of the sealed door markers. Tell players they can’t move through one-way doors.
12) Houserule that puzzles effectively end the player’s turn, allowing them to work on the puzzle until their turn next comes up (without stopping the game)
13) For new players: have the character and trait cards (optimally) pre-selected for them (for an easier, faster first time experience where they can focus just on the rules and not choices that they have no context for).

For extreme streamlining, I've also removed: Skill points, Horror checks, Darkness modifiers, Hiding, Barriers, Hiding/Barrier Monster attack cards, Mythos cards and Trauma cards, and replaced Investigator attack cards with:
Ranged weapon: Markmanship
Sharp melee weapon: Dexterity
Blunt melee weapon: Strength
Unarmed: Strength (2 damage)

Also, if an investigator performs the evade check so that he can perform an action other than attacking, and then wishes to move, he may do so freely. He has already evaded the monster and does not need to do another evade check to move away.

Here's a possible idea for quicker setup at someone else's house:
Have the room cards presorted into 2" coin sheets (like you use for coin collecting), each pocket labeled with a room name.
Then when it's time to set up the board at someone else's house, just place a magnifying glass in each room (to represent whether it's been searched or not).

Thanks, your advice about interpreting the rules makes sense. Mack

Page 3, "Lock cards . . . prevent investigators from entering a room . . . .  Obstacle cards . . . prevent investigators from exploring that room . . . ."  (emphasis from Rules of Play).  
 
I believe this distinction between locks and obstacles is more useful than "physical vs. prevents Investigators from continuing," because both a Lock and an Obstacle interrupt a step, i.e., "prevent from continuing."  The Lock interrupts a Movement Step, and if the Lock is defeated, the Movement Step is completed.  The Obstacle interrupts an Action Step (Explore), and if the Obstacle is defeated, the Action Step (Explore) is completed.  Page 17, "By completing a puzzle [on a Lock or Obstacle], the investigator can proceed with the movement or exploration the puzzle was hindering."

There is nothing in the rules that indicate that movement is evade-free after an attack; an investigator must perform an evade test before any non-attack actions.
 
"An investigator must make an evade test against every monster in his space before moving or performing non-attack actions"
(page 14)
 
"Attacking a monster does not require making an evade test." (page 15)
 
When reading the rules, it's a good idea to focus on what they explicitly allow instead of looking for things that are not disallowed. You could easily ask "can I take three extra movement step after an evade test?" - there is nothing in the rules which explicitly prohibit this, but it's still not how you should play it

Mythos and Trauma are kept hidden.
 
"All Mythos and Trauma cards in the keeper’s hand are kept secret from the investigators." (page 10)
"Mythos and Trauma Cards:Any cards in the keeper’s hand are secret and may not be seen by the investigators." (page 25)
 
Keeper Action cards are visible, except for in Call of the Wild.
 
I could not find anything directly in the rules, but Call of the Wild explicitly changes the behavoir.
"Call of the Wild Keeper Action Cards are kept hiddenfrom investigators until used." (CotW, page 11)