Oooh, I'm going to answer back all numbery, too!

Number one - River's a class act like that. :P
Number two - BONKING ROFL
Number three - Yeah, Jayne has some yucky chores I sure as hell wouldn't want to do.
Number four - His death was a little over the top this time around. I don't plan on killing him again so this is really it, all I have the stomach for.
Number five - Hahah, yes, Jayne has grown so much as a person. XD