I'm really liking the variety of weapons it appears that Sam Jackson is using to fight these snakes. Previous trailers showed a gun and a Taser, and now it looks like he's got a harpoon gun and something to shoot fire, too. It's like they gave up on making this a movie and decided to make it more of a first-person shooter.
In this age of increased airport security, increased sensitivity, and general fear, it's nice that one movie is willing to say, "F*** it. Let's just put some snakes on a plane with some random weapons and see what happens."
NOTE: If he shoots that harpoon straight down a snake's throat and stick it to a wall, I'll shit myself.