And Your Little Dog, Too!: Malachi taunts Jughead that the Ghoulies will come after Betty once they're finished with him. He naturally does not take it well.
Anguished Declaration of Love: Of a sort. Before giving himself up to the Ghoulies, Jughead makes one final phone call to Betty, telling her he will always love her.
Badass Boast: Cheryl telling the Black Hood that she only misses when she wants to miss while aiming at him with her bow.
Big Damn Heroes: Archie on the rooftop of Pop's Diner throwing molotov cocktails at the Ghoulies attacking from the outside before Tom, Fred and FP drive off the invading gang with a shotgun.
Break Them by Talking: While giving her "The Reason you Suck" speech to Hal (to distract him so Betty can grab the fireplace shovel to knock him out), Alice doesn't shy from twisting the knife a little bit by basically telling him he has a weird Oedipus complex for his mother, that he's a fail-serial killer, and finally that she cheated on him with F.P., who, BTW, "is more man than (Hal) ever was, in ANY way". Hal's reaction is not very positive, to say the least.
The Bus Came Back: Penny Peabody, who was last seen in 2.12, and the Ghoulies, who were last seen in 2.06.
Defiant Captive: Toni, who is being held captive by Penny, tells the latter to go to hell after Penny threatens to skin her should Jughead not come.
Downer Ending: Hal is arrested for his crimes as the Black Hood, but Betty and Archie find out there is still another Black Hood out there. The Ghoulies vow to bring down Riverdale come morning, and the episode ends with FP carrying Jughead's seemingly lifeless body after the latter's now Senseless Sacrifice.
The End... Or Is It?: The episode hints that Hal wasn't working alone as the Black Hood, and there is still another at large, as earlier in the episode a masked killer attempts to shoot Fred at the same time as when Hal is preoccupied with Alice and Betty in a different house.
He Didn't Make It: FP informs the Serpents that Fangs has died from his gunshot wound.
Heroic BSoD: Betty is so stunned at the sight of Jughead's horrifically maimed body that she is frozen in shock, unable to say a word.
I Lied: Just as a group of thirty Ghoulies descent upon Jughead to beat the living daylights out of him in exchange for peace in Riverdale, Penny gleefully taunts him that his sacrifice is all for naught and breaks her end of the bargain, claiming the Ghoulies will destroy Riverdale anyway.
Manipulative Bastard: Hiram, of course. After the Ghoulies threaten to drive the Serpents out of Riverdale, Jughead pieces together Hiram's culpability - Fangs getting shot, leading to the riot, the Ghoulies invading - all a plot to get rid of the Serpents. Veronica, meanwhile uncovers the October Surprise he was planning on using against Fred, even though Hermione would suffer a bit as well.
Molotov Cocktail: Archie and Pop Tates' plan on how to defend the Chocklit Shoppe from the Ghoulies.
Veronica calls out Hermione for not only sticking with Hiram despite all the shady things he has done, but also planning on releasing her affair with Fred last season as that could not only destroy his campaign, but also his life.
Then, Alice calls out Hal for being a Hypocrite for killing people he deemed sinful, like Fred for having an affair with Hermione, while he himself had an affair with Penelope Blossom.
The Reveal: Hal is the Black Hood. And that there's possibly more than one Black Hood running around.
Revenge by Proxy: Lampshaded by Small Fry when he confronts Hermione and Veronica.
Small Fry: My father told me that if he was ever murdered, not to take the life of the man who killed him. But to take the lives of those that man loved the most.
Take a Third Option: When the Serpents vote to face off against the Ghoulies in a do-or-die resistance against a siege the latter is threatening, Jughead makes a deal with Hiram, who was responsible for hiring the Ghoulies, in that he would turn himself over to avert the war. Immediately backfires as after Jughead is beaten, Penny declares she isn't even honoring the deal, and claims Riverdale will go down in flames.
Took a Level in Badass: Cheryl, and how. When the Black Hood attacks her house with an axe, she grabs her bow and hunting cape, confronts him face-to-face, and chases him off into the woods.
The Vietnam War: When asked if he has a gun, Pop Tates says that he doesn't because he's got more than enough gun trauma from "the war". Combine this with his mention of having to defend the Chocklit shop during 1970s riots and the timeline suggests it was indeed Vietnam he refers to.
Too Much Information: To a certain degree, as basically Alice implies that F.P. has pretty decent, err, natural attributes when she tells Hal he is "more of a real man than Hal is in any way".
Wham Episode: A given, being a Riverdale season's penultimate episode.
You Have Outlived Your Usefulness: Despite putting him up to the shooting in the first place, Hiram laughs off Reggie's plea for help during the riots and leaves him to his own devices.