Dean: Clear eyes and clogged arteries, can't lose. This is in response to Sam after he orders two burgers. "Clear eyes, full hearts, can't lose" is the football teams slogan from the TV show Friday Night Lights.
When they are filming Sam & Dean, while they zoom the volume goes up. Cameras do not work as such, either a high sensitive directional mic(which they do not have) or a boom mic which wouldn't allow them to get any closer without being spotted.