- Bullet Proof Vest: Scully's wearing one when Barnett shoots her. Of course, the audience doesn't know this, so we're supposed to believe she's been fatally wounded.
- Creepy Blue Eyes: Barnett's blue eyes are glassy and glazed over, and they appear dead. Even the pupils are blueish. They definitely fall into the creepy blue eyes variety.
- Criminal Mind Games: John Barnett plays them with Mulder. His notes read as follows: "Fox can't guard the chicken coop," "A hunted Fox eventually dies," "Funerals for Fox's friends — then for Fox."Mulder: I got some dead man robbing jewellery stores and sending me haikus.
- Death Faked for You: Ridley issued a false death certificate for Barnett.
- For Science!: Ridley's experiments. The government is interested in his work, but he mostly just seems to enjoy it.
- Gunman with Three Names: John Irvin Barnett is one of the many monsters of the week with impressive name.
- It's All My Fault: Mulder, regarding the deaths of Barnett's hostage and a fellow FBI agent.
- Monster of the Week
- Reptiles Are Abhorrent: Ridley uses salamander cells to de-age Barnett, giving him a horrifying reptilian hand in the process.