Go Through Me: Maggie Scully steps between Scully and Mulder while Dana threatens to shoot him, talking her down from her paranoia.
Hallucinations: Of your worst fears, like being cheated on and abandoned, or facing a sadistic dictator who caused genocide.
I Know What You Fear: It's revealed that people are controlled by Subliminal Seduction transferred through TV broadcasting. It caused them very vivid hallucinations of their worst fears which compelled them to murder, in one case even their loved ones. Scully thought that Mulder is collaborating with The Conspiracy and he helped them to abduct her.
Myth Arc: Subverted. It doesn't directly feature elements of the Myth Arc, but it features almost all the characters such as X, The Cigarette Smoking Man, The Lone Gunmen and even Scully's mom.
Mysterious Informant: Mr X steers Mulder into investigating the case. He uses a middle man in this episode, whom Mulder openly distrusts.
Ominous Visual Glitch: Distortions of the picture implied that a person is under influence of subliminal transmission that triggered the person's worst fears and compelled them to kill.
The Only One I Trust: Mulder says this to Scully, word for word, as she holds a gun on him in her mother's home, convinced he has betrayed her.
Unreliable Narrator: A subtle example. Much of the first half of the episode takes place mainly through Scully's perspective, in which it appears that Mulder has betrayed her and the X-Files to the Cigarette Smoking Man. About halfway through, the episode switches to Mulder's viewpoint, where it becomes clear (if it wasn't already) that Scully has fallen victim to the brainwashing and is acting completely erratic.