Trivia: Throughout the movie the killer is portrayed as a childish, tantrum-throwing, reclusive psychopath with no self-control, who receives orders to kill from neighbor Sam Carr's black dog that trots into his bedroom. The character portrayal is inaccurate and the scene with the dog was obviously added to be a darkly humorous moment. In real life David Berkowitz served in the army, held jobs afterward, participated in satanic cult rituals, and used hallucinogenic drugs. And when pressed for his true motives by an FBI agent after his conviction he admitted that he targeted young ladies because he harbored negative emotions toward women. The order from the dog was a story that he initially told the police to preserve the option of pleading insanity, but he would later choose to plead guilty.