Martin H, I think jonpall noticed the spots where I experienced tension. When I sang words like "break," "protection," and "take" during the chorus.
I actually practice with a poker face, haha, but maybe I felt like I needed to put on a show for the camera, so I ended up with all those funny faces and unnecessary muscle tension. I'm really going to have to look into curbing to see if it's going to help me out.
Thanks everyone!