Another "glitch" that is weird, but looks cool. It's in the second stage where you have to go to the check point at the rail road. Before engaging the enemies (after reaching the check point). Get in the prone position (on the floor). Move towards the rail car on the right. Mitchell will start to climb an invisible hill. When he gets a few feet off the ground he'll stand up and be in a perfect "crucifix", arms outstretched, legs together. You can float around the back of the rail car. I've done it a few times.