"The Hole" features limited non-diegetic sound, as the film aims to reflect a real situation and relate to and engage the audience as much as possible. Diegetic sound shows the reality of the film, and creates a fairly empty, quiet atmosphere that has an effect on the way the film is viewed by the audience.
"The Devil's Rejects" does not try to make the film too realisitic, and uses much non-diegetic sound, especially during scenes containing sex or drugs, and the main scene of violence at the end.
"Amusement" uses an equal mix of diegetic and non-diegetic, possibly to aid the scenes in their effects upon the audience, and uses fast paced music to create suspense and tension.