From "The Road: John Hillcoat's diary," published today at the Telegraph:

February
I then got Kodi to record the entire script so that Charlize could listen to him on her iPod and get to know how he sounds. I encouraged Viggo to hang out with Kodi as much as possible, and Viggo took him to the Bodies exhibition in Pittsburgh, which is made up of hundreds of specimens of dead human bodies. They later found packages of edible dried insects in a local shop – crickets and maggots in either chilli or salt and vinegar flavours. We decide to use the chilli crickets for the movie.

Later: 

November 6
Today was the day of reckoning. Joe Penhall and I went to New Mexico to show the movie to Cormac McCarthy, who lives in Santa Fe. Cormac pulled up in an old beaten-up Cadillac and we went into this strangely empty massive hi-tech studio. When the lights came up afterwards, Cormac didn’t say a word. He excused himself to go to the men’s room and was gone for 20 minutes, and we were thinking, 'This is not good…’ Finally, he came back and said, simply, 'It’s really good. This is like nothing we’ve ever seen.’ When I started to press him for details, he cut me off, saying, 'Look, I didn’t come all this way to blow smoke up your ass.’ Then he took us out for a seven-hour lunch. The only thing that he missed from the book was four lines of dialogue, which luckily we had filmed, and put back in. He loved the movie.

I loved this book, but I still don't think I'll see the movie.