Oh, I forgot to mention -- I loved the idea of the Possessor ghost. It was a very clever idea that was used well to make it very menacing. I love the idea of it possessing the cylinder to steal it, throwing it away, and possessing the garbage bag to run off with it.
Having it animate the library lion was a bit nostalgic for me, since back in college, I had ambitions of making an amateur sci-fi film, and one of the FX sequences I imagined doing would've been a stop-motion scene of an alien energy being possessing one of the university's trademark stone lions to attack the heroes. (I never got around to actually making it, though, since I realized I enjoyed planning it more than I would've enjoyed the work of making it, and the results would probably have been far less satisfying than they were in my imagination.)