Yeah, I know, it's pretty late to be commenting on this episode - but I didn't get to watch it until yesterday. I won't be going on about the "great episode, amazing acting etc. etc. " stuff - I just wanted to add two things to the discussion:
1. WOW, DID LUKE PERRY GET OLD! Never in a million years would I have recognized him, if I hadn't read his name in the credits (and I looked at IMDB to check whether it's the same Luke Perry who played Wosshisname in Beverly Hills seemingly a hundred years ago). Hm, seems I'm no longer 13 as well...
But he made the impression of a much better actor to me yesterday than in the nineties. Cyrus was a brilliant villain imo, and he actually managed to secure some initial sympathies! My Kudos to Luke Perry for this role. Seems he aged well 
2. The bugs. As I understood it, they installed laser microphones, not simple bugs. That's why Emily lifted the blinds with her heel to give them a better reception. (Laser microphones measure the vibrations sound causes on glass surfaces such as windows and through an electronics signal conditioning and acquisition the vibrations are calculated back to sound waves / voices. I hear, it works pretty well although it sounds pretty James-Bond-like). How they could witness the beating, however, in a room that had no windows that I could see, I'm at a loss to explain...