Bar Brawl: Liam when he first catches Darla's eye.
Calling the Old Man Out: Liam became a vampire as a result of a noisy confrontation with his father, which resulted in him getting kicked out. As Angelus, he later "triumphed" by killing his family, saving his father for last.
Father: Whoíll take you in, huh? No one! Liam: Iíll not lack for a place to sleep, I can tell you that.
Fantastic Drug: A yellow-ish liquid is driving normally peaceful demons into a frenzy.
Wesley: Well, itís difficult to say under these primitive conditions—but what I can tell you is itís synthetic. It seems to contain properties not unlike street PCP, though more metaphysical in nature of course. I did identify Eye of Newt as one of the ingredients, but one suspects added chiefly for taste, rather than kick.
Futureshadowing: The newly risen Vampire!Liam mentions his little sister Kathy believed he had come back to her "an angel."
Get Out: Kate, crying over her father's body, rejects Angel's attempts to explain what happened.
Have You Told Anyone Else?: His crooked cohorts ask Trevor if he's told his daughter about his dealings with them. Trevor is smart enough to realize where this conversation is going and reaches for a hidden gun, not realizing he's dealing with two vampires.
Laser-Guided Karma: Inverted—a theme of the episode is that people can suffer terrible consequences from a wrong decision. Case in point: Trevor gets involved with drug dealers knowing exactly what they're up to, but that doesn't mean he deserves to die at the hands of vampires.
Meaningful Echo: The inscription on Liam's gravestone reads BELOVED SON, that on Trevor Lockley's reads BELOVED FATHER.
After he was first made a vampire, Liam (not yet Angelus) tricked his own baby sister into inviting him in on the pretense that he was an angel taking the form of her beloved dead brother. Cue aversion of Infant Immortality.
In the present day, Angel watches helplessly as two vampires murder Trevor Lockley, who had invited them in earlier but refused to invite Angel in because he knew violence was about to ensue and assumed Angel was an Innocent Bystander. Angel unsuccessfully tries to deter the vampires by saying he'll kill them the moment Trevor dies and he can enter.
Nameless Narrative: Neither the demon nor his henchvamps are named in episode or scripts. The demon is referred as "Head Demon Guy", while the leading vamps are "Vamp 1" and "Vamp 2."
Ship Sinking: The death of Kate's father at the fangs of vampires kills off what little romantic potential she has with Angel after discovering his vampire nature in "Somnabulist".
Suspect Is Hatless: When interviewing witnesses to a demon assault on the subway, the best Kate can glean from them is suspect is of "average" height, "average" build, and "average" weight. Well, that was helpful.
Angel: Itís just that the ah, Evil Thing—turns out it wasnít an evil Thing. Kate: The evil thing wasnít an Evil Thing? Angel: Well, it was an Evil Thing in terms of that word. It just wasnít an evil Evil Thing. Kate: There are Not Evil Evil Things? Angel:Wellóyeah.
Time for Plan B: Angel is arming himself to the teeth—throwing star, knife at his waist, knife at his ankle, arm sheath stakes.
Tradesnarkô: As Wesley is reading aloud from the owner's manual for Cordy's new security system, he actually recites the "TM" at the end.
Tough Love: What Liam's father seems to have been going for; he spends all his time telling his son he's useless and not a real man, and that if he leaves now he can never come back... And only realizes when Liam tells him to get out of the way that, well, it didn't really work the way it was supposed to.
Darla: Your victory over him took but moments. But his defeat of you will last lifetimes. Angel: What are you talking about? He canít defeat me now. Darla: Nor can he ever approve of you—in this world or any other.
Where I Was Born and Razed: Darla asks a newly-risen Angelus who in his village he intends to kill first. Angelus replies, "I thought I'd take the village."
Head Demon Guy: Do you know what walks this city? [Kate shoots him four times; he barely flinches] You have no comprehension! You do not understand what stands before you! Angel:[Axe TwirlingWalk-In Chime-In] A big, ugly drug-running demon, who thinks he is a lot scarier than he is, maybe? Yeah. She knows.
You're Not My Type: Kate's father suggests the possibility of Kate and Angel getting together. Kate responded, "He's not my type. Or I'm not his. There's definitely a type involved, and it's the wrong one."