Actually Pretty Funny: When Angel is adamant that Wesley cannot do the ritual, Wes tosses a crucifix at him and suggests that he do it himself. Despite the cross burning him, Angel's reaction is along the lines of, "Yeah, that was cool enough for me to think of."
Beethoven Was an Alien Spy: Wesley mentions Lizzie Borden, the famous Massachusetts woman accused of butchering her parents with an axe. She, too, was possessed by an Ethros demon. Angel notes ominously that the demon possessing Borden was only an adolescent.
Badass Boast: The Ethros demon gives one to Angel and Wes, right before he reveals that he's a Death Seeker and Ryan is the true monster.
Ethros demon: You are a fool. You think to destroy me? Youíre dealing with forces beyond your comprehension. [...] I am Ethros. I corrupted the spirits of men before they had speech to name me. The child was but the last among tens of thousands, one more pure heart to corrupt, one more soul to suck dry.
Buffy Speak: When Seth says the roast was a little dry, Angel assures him it was full of "roasty goodness."
Creepy Child: The child is already psychotic, and the demon is trapped inside as he has no soul to corrupt.
Death Seeker: The Ethros demon, after being trapped in Ryan's body for so long, unable to control it.
Description Cut: Wesley says that if a possessed person eats eucalipsis powder, the demon within is forced to reveal himself. Cordy asks how Angel is supposed to get the Anderson family to eat the powder. Cut to Angel knocking on the Andersons' door with a plate of brownies.
Demonic Possession: Ryan, the Andersons' son, is possessed by a type of demon known for such activity—but that's not his biggest problem.
Detect Evil: The elderly nun is able to sense Angel's true nature, though she stays fairly calm about it.
Nun: How can I... [sees Angel] You would come into a place of worship?
Angel: ...I'm not what you think.
Nun: No? [tries to touch Angel's hand with her rosary; he pulls away]
Honest John's Dealership: The only way to contain an Ethros demon is to trap it in a rare Ethros Box. Angel gives Cordelia the address of a shop he knows downtown, Rick's Magick & Stuff; Rick, however, does not have a box carved by "blind Tibetan monks," so Cordy instead buys a cheaper Shorshack Box made by "mute Chinese nuns." Rick warns her it might be a little "tight across the shoulders" for the Ethros (oh boy, this'll be fun). Predictably, the box bursts into splinters when Angel and Wesley exorcise the demon into it.
A House Divided: The demon tells Angel that Wesley is planning to kill him. Later Wesley tries to assure Angel that it isn't true, but Angel says it's OK; he knows Wesley is prepared to kill him, which is a good thing if Angelus returns.
Layman's Terms: Angel describes where they might find an embodied Ethros demon. Wesley translates.
Angel: Heíll be looking for a hostile environment—somewhere damp. Probably returning to primordial volcanic basalt for his regeneration. Cordy: Huh? Wesley: Sea caves. Cordy: Why didnít he just say that?
Mundane Utility: Wesley shows Angel a Kek dagger, which is the only weapon capable of killing a Kek demon. Angel informs him that Kek demons are in fact extinct. Then Cordelia grabs the dagger to cut brownies.
Neurodiversity Is Supernatural: Subverted. Ryan was psychotic before the demon possessed him and in fact wasn't at all affected by it, but the demon does say that Ryan has no soul.
Now You Tell Me: Wesley brings a vial of green glowing liquid back to the office. Cordelia can't help but admire it.
Cordy:[picks up the vial] What is this stuff anyway? Kind of pretty! Wesley: Uh, itís the bodily excretion of an Ethros demon. Cordy:[puts the vial down and folds her hands] No one could have said "demon poo" before I touched it?
Oh Crap!: When Angel and Wes find that the only priest qualified to do the exorcism has been killed performing that exact ritual. When the Ethros destroys the box meant to hold him when exorcised. When Angel and Wes realise Ryan is the evil one, and is now alone with his family.
Psychic-Assisted Suicide: The demon-possessed Ryan "sleepwalks" into the middle of traffic, almost getting killed before Angel tackles him out of a car's path. The demon later confesses that he would have also died had the car struck. By leaping into a body of a remorseless child, the Ethros had unwittingly trapped itself forever, with death as the only escape.
Red Herring: The opening half has Angel suspecting the wrong man of being possessed. In the end the demon reveals that the child was born with no soul, and the demon had been the boy's prisoner while the child did the horrible things.
Too Spicy for Yog Sothoth: Only after taking possession of Ryan does the Ethros demon realize the child "has no soul." The demon is trapped inside Ryan and despairs at the feeling of "nothing" in the boy.
Unusually Uninteresting Sight: Ryan Anderson's reaction to Angel shoving him out of the path of a speeding car. Noticing the bloody scrape on Angel's shoulder, Ryan, who seems completely unfazed by his brush with death, asks Angel if he's going to cry. This is an early sign that this kid belongs in a padded room.
Voice Changeling: The Ethros demon possessing Ryan displays this ability. It taunts Wesley in a voice identical to his own, reminding him of his unceremonious sacking from the Watcher's Council; then it strikes out at Angel by channeling Doyle's voice, playing on Angel's guilt.
Weak-Willed: Angel tells Wes he can't carry out the ritual as he's too open to suggestion. "How many Thighmasters do you own?"