Re-Watching 'The Blind Banker'

 Just some things which came to my mind when re-watching 'The Blind Banker'.

• What happened to the man Sherlock was fighting while John was out shopping? Why is that guy Sherlock's message for the people of the Jaria Diamond case? Why shouldn't John know about this?

• Why does Sherlock not let John in the flat after he enters it via the balcony? Does he want to make sure it's safe? Or does he not want to be distracted by his friend?

• What did Sherlock need that pen he'd been waiting for 'about an hour'? Good, him catching it without looking is quite impressive. I give you that. But you could have made him actually do something with it.

• Why does John use Internet Explorer? WHY?

• What is Sherlock's motivation behind him not telling John about that guy in Soo Lian Yao's flat? Is he that vain? Or is there more behind it?

• Couldn't help noticing that John's phone has great picture taking abilities illuminating the whole chiphre on the wall. In 2o1o. And it's an old phone he got from Harry... 

• The most unrealistic part of the episode is that Van Coon has so many books. Have you met people making a great living working at banks? More importantly, have you met their bookshelves?

• The guy at the ticket selling boot at the circus has to notice that John is not Sherlock. When Sherlock turns up he introduces himself to John's date right in front of the ticket seller's eyes.

• Love the way John says 'this is... art', as if art were something disgusting.  

• And most importantly, why didn't Van Coon ask his secretary to give him the hair pin back? Why was he willing to die for it?