The Cuckoolander Was Right: Mulder acquired a tape of a mental patient rambling on about escaping the town. To the casual observer, he doesn't make any real sense, but he keeps saying something about a horrible way to die.
Dramatic Unmask: After shooting the executioner, Mulder pulls off his mask and finds him to be Sheriff Arens.
A Fęte Worse Than Death: The conspiracy of a bizarre town kills outsiders and turns it into a big celebration. The residents engage in a cannibalistic ritual borrowed from primitive tribes.
Genre Blindness: Invoked by Chaco, who says the townspeople will doom themselves the moment they begin turning on each other. No one heeds his warning.
Older Than They Look: Thanks to their, err, special diet, everybody looks much younger than they actually are.
Police Are Useless: Sheriff Arens is reluctant to cooperate in Mulder and Scully's investigation and appears disinterested in the whole thing. Justified because Arens is not only in on the Dark Secret, but he's the executioner.