Some are making a big deal over the lack of opening credits, as though it somehow affected the episode negatively for them.
From my point of view though, it seems perfectly obvious why, with the found footage theme, and more importantly the twist at the end, that the lack of credits actually enhanced the theme of the episode and made the scenario more believable.
I'd go so far as to say that it would have looked a bit silly and disruptive to the episode if there had been opening titles.
The right call for me. Plus, it's only opening titles. I seriously don't get why anyone would care about their absence in one episode anyway.