- Himself - Former Police Chief, Wellfleet, Cape Cod: Provincetown has historically been a place where people can go and, if you would, do your own thing. The Pilgrims came from England to be able to escape religious persecution and they landed in Provincetown first. Um, and Provincetown has always been known for a place where you could kind of do your own thing.
- Himself - Cape Cod Journalist and Broadcaster: Provincetown was a mecca for unusual people and artistic people. The fishermen were very forgiving of a lot of things.
- Himself - Former Boyfriend of Sydney Monzon: I recall havin' some conversations with him. If you had a debate with him, he had to be right. You know, there-dhere was no middle ground with Tony. He always... He had to be right, or, I guess, n-no matter what you were, wha... , eh, talking about. That's why he just kept to himself a lot, because a lot of people didn't wanna deal with it.
- Himself - Former State Trooper: Quite frequently he, uh, he kept changin' his story. He was tryin' to cover his tracks. In other words, he was tryin' to outfox the fox.
- Himself - Provincetown Resident: I'm a native of Provincetown, but if you came into Provincetown when you were eighteen-years-old, like he was, he could live his whole life here and they still consider him a "wash ashore." He's... was washed on shore. He's not a native.
- Narrator: Costa would later be diagnosed as a schizoid personality type.
- Herself - Forensic Psychologist: It tends to be people who just really like to stay alone, don't have particular connections with other people. They tend to find jobs where they can work alone. If a person's schizoid, they would tend to not value family relationships or have empathic relationships with friends. They would tend to want to stay on their own and have, um, much less interest in the mores of society.
- Himself - Prosecutor: When you see pieces of the body outside, uhh, and they're taken out and they're set down and their photographs taken, it looks like pieces of something, but when they're put on a white slab in the... in the mortuary, and their bodies are cleaned and you look at their faces, you can see the horror in their face. You can see the scream as they're caught just before death, and you don't forget things like that.
- Herself - Forensic Psychologist: Dismemberment takes time and a lot of effort and strength and s... and tools, so the dismemberment had to be significant to 'im. It can't just have been utilitarian. You wanna own them - totally. What better way to own a person than to remove parts of them, hold those parts? What greater intimacy could there possibly be for a killer who wants to continue to commune with the victims after death?
- Herself - Forensic Psychologist: [on serial killers speaking up for themselves in court] First of all, they believe they can charm the jury, secondly they want to keep control, and third, if they're narcissistic, they don't think that anybody can speak for them as well as they can speak for themselves, or defend them as well as they can defend themselves; so, they believe that, by testifying, they keep control over how they are perceived and what their legacy is gonna be and how the proceedings will go - and they are completely wrong about that; but, within their narcissistic frame, they can't see beyond themselves.