I saw Serenity very early Friday morning at a special showing which started just after midnight. I thought the movie was excellent, the best movie I've seen in quite a while.

The audience was not as pleasant as the movie. It was composed of two types of people: Browncoats and jerks. Of course, the Browncoats were "well behaved," the jerks were not. It took a little away from the experience.

My "clan" went to the special showing because of unrelated events that couldn't be rescheduled. We plan on seeing it again, soon.

As for the "I can kill you with my brain" comment from a Firefly episode, here are two possibilities: 1) it was a joke to "scare" Jayne (that's how I took it at the time I watched the episobe); 2) perhaps it was true, but only for Jayne or people like him in some way.

Like you, I don't understand why "they" didn't use the TV series theme song, but that didn't matter that much to me. It might be because of money, they didn't have a big budget. (Maybe Fox has some hold on the theme song.) Maybe the next Firefly movie will have a bigger budget. I think this one is going to be a popular hit which should help.