"No Country for Old Men"; Can someone help me interpret some scenes?

1. What was the purpose and meaning behind Chigurh's car crash?

2. In the early part of the movie, Llewelyn comes home to his trailer with the money and goes to bed with his wife. He later decides to go back out to the crime scene in the desert to take water to a victim. When he is going out the door he tells his wife "If I don't come back, tell my Mom I love her". She then says "Llewelyn, your mom is dead" and he says "Then I'll tell her myself". Does Llewelyn forget his mom is dead? Is this symbolic? I just didn't get it.

3. How is Ellis related to Sheriff Bell? Bell goes to see him at his messy home and he was in a wheelchair. He told a story that I didn't really understand.

4. I had a hard time piecing together the death of Llewelyn. I presumed that he went to a gals' room to have beers. I didn't realize he was dead until Sheriff removes his hat when he sees Carla Jean. Did I miss some footage? How do we know that Chigurh is the one that killed Llewelyn?

Wow, you caught a couple things I didn't.

1) This is a tough one but my guesses are:
a) The audience can't tolerate Chigurh just getting away clean.
b) We see that Chigurh isn't just supernaturally evil & is always lucky. He's not lucky but incredibly tough.
c) We see how fair he is with the kid. He is pricipled; maybe more than anyone else.

2) I hadn't caught this. But I'd say this: Llewelyn's behavior here (taking the water out) is stupid. What motivates it? He must have been having a conversation with his mother while lying in bed. Maybe such a detailed one that he'd forgotten she was dead.

3) No clue. I don't remember the story well, but it is related to "this is no long a country for old men." A place that used to make sense in terms of decency and principles. Now there are still principled men like Chigurh, but no decency.

4) Chigurh didn't kill him. A couple of Mexican hit men did. I found this part of the film too brief and weak, but it is again a bolt out of the blue, like the car crash at the end. Llewelyn had too many forces in the universe lined up against him. I think the filmmakers wanted the shock value of taking out their hero so casually and quickly.

You can watch it free on linkjoy.org