I just finally read James Dickey's novel "Deliverance," and was struck by how great the movie truly is. The novel actually reads almost like the script. It lends some depth, but the acting is so good in the movie that most of it is there anyway. I think the movie is better than the book actually, which is a rare occurrence ("The Swimmer" with Burt Lancaster is another, and maybe "No Country for Old Men," to pick a recent example).
I was happy to see that one of the best lines in the movie is in the original as well: "Machines are going to fail."
Longtime readers of the Apistogramma will recall that line fondly, I am sure.