The film's "score" also counts. The composer evidently wanted it to sound creepy and atonal but had no idea how to mix it properly. The results sound like a bunch of random electronic noises horribly mushed together, and it gets quite grating after a while.
What An Idiot: Rather than leave things up to the police and their recruits, Peter and Ingrid take matters into their own hands, running off into the wilderness... alone. Granted, they do ultimately kill the maniac.