So if it's continuity error then there's still the contradiction with what Sherlock says about "she destroyed it", as well as Mary's staff comment which is at odd with the explanation. Still can't figure these points out right now!

Sherlock wasn't there when it was destroyed.  Possibly John or Mary told him, but didn't specify who had physically put it in the fire.  But I think the point of him saying "she" is for Ajay to pick up that he knows Mary. 

I don't think we see proper mind palace sequences all the way through this episode. But there are a number of hints that we all see many sequences as they play out in Sherlock's mind. There are many hints because apparent continuity errors are about things Sherlock could not have known about from first-hand experience - like on which side of the bed John and Mary prefer to sleep. Some sequences are shown twice and in slightly differing versions - as if the narrator isn't quite sure about what really happened. But I have a hard time to make up my mind about the memory stick. We are shown a flashback from HLV where John throws it into the fire. Since Sherlock wasn't there when it happened and since he apparently believes that Mary destroyed it, this flashback sequence cannot have come from the inside of  Sherlock's mind. It's what objectively happened. So, not everything we see in TST is distorted through the lense of Sherlock's mind. Which makes it even more difficult to distingush what's real and what's coming from an unreliable narrator called Sherlock 

Last edited by sherlocked (January 5, 2017 12:14 pm)

besleybean wrote:

Why would Sherlock be imagining John and Mary in bed?!

Because he tells Ella about them.

besleybean wrote:

We think...

If not Sherlock, who would be the narrator of this episode?

besleybean wrote:

Does it need a narrator?

Well yes, every story needs one. It can be the all-knowing narrator but that would be a first for "Sherlock". The first episodes were told from John's POV, with S3 it changes to Sherlock's.