I have to disagree here. It definitely showed a large field of bodies he found when he fell into a water hole while trying to escape. It was one of the most horrifying scenes in any movie I have ever seen and definitely let you know the whole sale murders going on. You have to see the scene to appreciate it. The Killing Fields is an excellent movie that does not glorify Communism in any way.
It also annoyed me that a radio was playing the 1974 Paul McCartney song "Band on the Run" in a scene set in 1973. Such anachronisms are one of my pet peeves about recent movies.