It makes sense that it was Mr Smith who moved the mannequin, the method used to set the trap there was almost identical to the one he used earlier... unless the boss monster fella decided to go out and copy what he'd seen of course.
It certainly opens up a lot of questions anyway.
I was very impressed with the realism of the CGI though, especially for the city scenes.
The book sounds so much better though, I suspect I'll pick a copy up - I like the idea of there being more "normal" people out there that Neville is hunting out too, the fact that he's actually the monster as much as the zombie vampires are, that seems to have been lost in the film.
To me he "is Legend" because he found a cure in the film whereas the book has him as the Legend because he's become a mythical figure known for killing monsters and the more normal people as the master predator rather than a saviour.
I can't help wondering if it's actually just very cunning marketing so a DVD offering can be released with answers to some of the questions and an alternate ending...