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troperville

Sam, Dean, and Bobby are haunted by the spirits of people they failed to save. This is the "Rising of the Witnesses", one of the 66 seals broken before Lucifer is released and the apocalypse comes.

Body count

For this episode = 3 humans and 5 ghosts.

For the series so far = At least 253 humans (of which 3 were witches), 51 demons, 24 ghosts, 10 vampires, 6 changelings, 3 gods, 2 shapeshifters, 2 werewolves, 1 cat, 1 crocotta, 1 djinn, 1 rakshasa, 1 rawhead, 1 shtriga, 1 wendigo, 1 zombie.

Tropes

And I Must Scream: Meg makes perfectly clear that she was fully conscious when possessed by a demon and wanted Dean to free her.
Anyone Can Die
- Body count for this episode = three humans (all hunters) and five ghosts.
Arbitrary Skepticism: As in the last episode, Dean still refuses to believe angels and God exist.
Captain Obvious
Sam: Where are we going?
Bobby: Someplace safe, you idiot!
Come Out, Come Out, Wherever You Are
Cold-Blooded Torture: It's revealed that in "Jus In Bello", Lilith tortured her victims before killing them, including flaying Nancy alive.
Crazy-Prepared: Bobby and his salt-coated, fully stocked, iron panic room.
Creepy Twins / Finishing Each Other's Sentences: The little girls who haunt Bobby.
Daylight Horror: The junkyard
Do Not Taunt Cthulhu / Good Is Not Nice
Castiel: You should show me some respect. I dragged you out of Hell. I can throw you back in.
Driven to Suicide: Meg's sister.
Falling Chandelier of Doom: Bobby has one made of iron which Dean uses to banish a ghost.
Ghost Butler
Have You Seen My God?: Dean asks where God is.
How Many Fingers?: Dean asks this of Sam.
I Got You Covered: The brothers have to fend off the ghosts while Bobby does his spell.
In Mysterious Ways:
Dean: If you say 'In Mysterious Ways,' so help me I will kick your ass.
Mind Rape: Meg was fully conscious as the demon used her body to kill; Agent Henderson was forced to watch as Lilith tortured and killed everyone in the police station, including Nancy, whose skin was ripped off.
Our Angels Are Different: lampshaded
Dean: I thought angels were supposed to be guardians. Fluffy wings, halos — You know, Michael Landon. Not dicks.
Castiel: Read the Bible. Angels are warriors of God. I'm a soldier.
Putting a Hand Over His Mouth: Done by a couple of little girls to Bobby.
Running Gag: Dean likes pie.
Rustproof Blood: Although Olivia has been dead for three days, she's still very red.
Sealed Evil in a Can: Lucifer, who Lilith is trying to release
Shout-Out: From The Good, the Bad and the Ugly. "If you're going to shoot, shoot. Don't talk."
Similarly Named Works: Are You There God? It's Me, Margaret, the 1970 book by Judy Blume.
Speak In Unison: Sam and Dean. "A sign of what?"
Talking in Your Dreams: Implied with the sudden cut to Dean waking up after his conversation with Castiel.
Wall of Weapons: In Olivia's closet
Wham Line: The Apocalypse and later on, Lucifer walks free.
What the Hell, Hero?: Loads of this from the ghosts.
You Monster!