I also liked the nod to X Files with the location captions throughout both episodes.
And the Gwen/Gwyneth thing was a nice touch, even if it was just for the dorks.
Overall, I'm generally happy with the episode, but there's still something I can't quite figure out that I didn't like about it. I've been pondering since Saturday...
I'm actually happy to see Donna go. I didn't think Tate suited the show.