The scene between Charlie and Anita was the best this episode had to offer, yet that scene was still a little less then it could have been. They were both flirting with the same idea of him no longer being her teacher and I think that the show should have finished it with a kiss / something. Perhaps they were saving it for the season finale, maybe not.
I thought the case was pretty random. A possible UFO / terrorist attack that turned out to be pretty much nothing important. The son killing his father in the long run was another random twist, with us only finding out with 2 minutes left in the episode.