Anytime we’ve been shown John writing up his blog- onscreen- it has looked like this:
However, in T6T, whenever we see the writing of John’s blog, it appears like this:
Nothing about the “Blog of John H Watson” or date, merely the title (we know how much Sherlock really loves the titles, no matter what he says because that is not the face of a man who could care less about the title)
Why change the format?
We also see that John isn’t even present for some of the cases, when clearly the ‘write-ups’ reflect that who ever is writing them was there when the client showed up:
For each and every case we see in this montage, the text of the blog posts coincides with Sherlock being on his phone, typing away, making it look as if he is writing them.
AND, the only time we see John ‘writing’ anything, it is a fake: