Nervous Accountant: Are you going to shoot me?
Anton Chigurh: That depends. Do you see me?
In the scene at the motel where Chigurh kills three men, he goes to sit on the bed where he removes his socks. In the background one of the 'dead' men opens his eyes and looks around.
After burning and exploding a car, Anton Chigurh enters in a pharmacy called Mike Zoss Pharmacy, to steal syringes, antibiotics and other stuff. The Coen brothers hung out at the real "Mike Zoss Drugs" when they were growing up and named it after him in the film as an homage. Mike Zoss Productions is the name of their production company (also named after the same man).