Came across this recent video breaking down the acting in No Country for Old Men. It's pretty new --- was uploaded one month ago.
The Anti-Method Acting of No Country for Old Men | Acting Breakdown
https://youtu.be/3o6OmgsLIjQ?si=0Aq56A3BVKGurO6Q
Fantastic editing. Overall, it's a pretty great video breaking down how grounded/normal everything was during filming. Generally speaking, with movies like this, you kind of assume it will be pretty serious and weird.
There were a lot of interviews here that I hadn't seen before, particularly with Kelly MacDonald who talks about her character Carla Jean. If I had to guess, I believe this is from the extras on the DVD.
The most striking thing for me was something Kelly MacDonald said about Carla Jean and Llewelyn:
"They didn't even need the money --- they had everything already."