If you have not seen the film please don't read any further............................................

On first viewing I had the same feeling about the ending, I was too focused on a confrontation that never took place, between the sherrif and Anton Chigurh, when it didn't happen I felt like I was punched in the gut ... took a second viewing to realize the genius of the film..

And in response to just saw it's comment: Anton was not under the bed, the Sheriff noticed the bathroom window was unlocked and knew he slipped out the back...