...to be sure, there are already enough reviews of this episode, but I wanted to point out, my perspective: that of admiring Dan Castellanata. We all know him as the voice of Homer--and countless others--on The Simpsons; but I enjoyed this opportunity to see him acting *on* screen, as opposed to *behind* the screen. I feel that Castellanata is a very good actor doing a wonderful job with the emotions in this episode, particularly his sadness at the death, and elation at the continued existence of Daniel, because he did indeed know Daniel, through Jack.
Aside from dealing with the range of emotions brought on by his visions, "Joe" had to deal with the decline of his business and deconstruction of his marriage all because no one believed that his visions were real, but manifestations of an apparent break with reality. (In fact, this is very much how things seem to a schizophrenic.)
Castellanata portrayed "Joe" as a character any of us could imagine in ourselves, if such circumstances could exist, and kept us wondering how this situation would be resolved. Sadly, this is one more instance of the resolution coming quickly, in the last few minutes, and without a lot of believability (was "Joe" to just return to his former life and tell everyone, "Gotcha!"?)
Some may consider this "just a clip episode" and write it off as unnecessary to the story arc; to them I say: Lighten up and enjoy the very credible story presented by Castellanata! It's interesting, fun ("you might want to consider locking your door"), and brings a necessary lightness to the series that we need once in a while to keep us from grinding our teeth at night!