I'll try to post these every other week day (Mon-Wed-Fri), but I make no guarantees. Sometimes there will be more than one cap for a beginning or ending of an episode. I'm also using my capper's discretion - meaning I'm choosing the most aesthetically pleasing image that we see first or last not always literally the first or last things we see. I'll explain this as we go along.
:: Click on images for the HQ versions ::
4.03 Beginning: We begin with this view in the mirror of Dean asleep in a motel room, his leather jacket as a blanket.
Sam steps into view in the mirror, obviously sneaking out. He pauses at the door for one last look at Dean.
4.03 Ending: The episode ends with Dean waking up from his time traveling trip and finding Sam gone and Castiel issuing this warning: "Your brother is headed down a dangerous road, Dean, and we're not sure where it leads. So stop it. Or we will."