I've not seen much in the way of other adaptations, but isn't this Moriarty supposed to be the first Moriarty who's Irish? Given that Moriarty's an Irish name and all...

The second episode does bother me, but for so many reasons. It's just weak and contrived compared to Gatiss and Moffat's episodes. Sherlock figured out that the tenant would be connected to the case because they didn't pick up their phone book from the front step? What? And everybody just happened to live and work in buildings with conveniently-placed terraces.