Nitpick: When Willow reads the doctor's papers, she says that he was trying to inoculate the kids. But inoculation is the introduction of a small amount of virus in the body to build immunity in the hopes that larger exposure will have no effect. It is pointless to attempt to inoculate someone who already has the virus, it only makes them sicker. So either the doctor was applying it wrongly (not farfetched considering his reputation), or he was using some other method and referring to it by the wrong name.
Goof: When Der Kindestod attempts to feed on Buffy the tendrils protrude from his eyes several inches. The camera angle changes as Buffy snaps his neck and the tendrils are gone.
Goof: In the closeup of Buffy's bed-side clock on her first night in the hospital, the time says 2:27 after it changes. Then they pull back to a wide shot, and you can see that the clock says 12:15.
Nitpick: It is doubtful that you will develop a high fever a few minutes after you drink the influenza virus, especially if you have had the virus before and you have been immunized.
Nitpick: About halfway through, Buffy is admitted to the hospital after she collapses from a fever but all her jewelry remains on her person instead of being removed according to hospital procedure.
Goof: When Buffy and Willow first look into the children's room after Buffy drinks the virus, the basement sign isn't there. But when Der Kindestod goes in the door after the kids, the sign is there.
Goof: After Buffy snaps the Kindestod's neck, his hat comes off his head and rests on the piping behind his head. But then the shot changes, and the hat is nowhere to be seen.
Goof: Why would they have basement access in the children's room? You would usually get there from the hallway and not from anyone's room.
Goof: When the doctor is thrown out of the room by death, the stunt person being used has dark hair and not gray hair like the doctor.
Goof: Buffy's hairstyle changes between cuts as she heads after Ryan through the hospital hallway.
Xander: Visiting hours are over.
Angelus: Well, I'm pretty much family.
Xander: Yeah. Why don't you come back during the day? Oh, gee, no, I guess you can't.
Angelus: If I decide to walk into Buffy's room, do you think for one microsecond that you could stop me?
Xander: Maybe not. Maybe that security guard couldn't either. Or those cops... or the orderlies... But I'm kinda curious to find out. You game?
Angelus: Buffy's White Knight. You still love her. It must just eat you up that I got there first.
Xander: You're gonna die. And I'm gonna be there.
Angelus: Tell her I stopped by.
Angelus: (to Buffy) You know, you being off your game is kinda taking the fun out of all this. (He punches her in the face, and she stumbles backward) Nope, still fun!
Xander: Hey, Buffy, we're all here.
Buffy: Hey... here we are. It's... all of we. Are we taking me home?
Doctor: No, Buffy, you need to lie down, honey.
Buffy: Yeah? Lie at home. My bed is better than any bed that's not my bed.
Doctor: She's still a little out of it.
Buffy: Shhh! Hospital zone - no singing.
Willow: Buffy, that's 100% pure. It'll kill you in an instant.
Buffy: Oh. They really should put that on the label.
Willow: It's my way of saying get well soon.
Buffy: You know, chocolate says that even better.
Willow: I did all your assignments. All you have to do is sign your name.
Buffy: Chocolate means nothing to me.
Xander: Flowers for milady.
Buffy: I think they call them balloons.
Xander: Yeah, stick them in water. Maybe they'll grow.
Xander: Do you think she's gonna be okay in here?
Cordelia: I don't know. Lysette got her nose done here, and she came in looking for the Gwyneth Paltrow, and it looked more like the Mr. Potato Head.
Willow: Buffy, you're sick.
Buffy: No, I feel fine. I mean, the world's spinning a little bit, but I like it. It's like a ride.
Cordelia: Eww, what does this do?
Giles: It extracts vital organs to replenish its own mutating cells.
Cordelia: Wow! What does this one do?
Giles: It elongates its mouth to engulf its victims head with its incisors.
Cordelia: Ouch! Wait, what does this one do?
Giles: It asks endless questions of those with whom it's supposed to be working so that nothing is getting done.
Cordelia: Boy, there's a demon for everything!
Xander: Finding out who this thing is takes priority. Cordy, you should go with Giles.
Giles: Why do I have to have... (looks at Cordelia) Uh, good thinking. I-I-I could use a research assistant.
Cordelia: (to Giles) Let's go, tact-guy.
Intern: What happened?
(at the same time)
Xander: She fell.
Willow: The flu.
Cordelia: She fainted.
Xander: The flu, fainted and fell. She's sick, make it better!
Cordelia: So this isn't you being afraid of hospitals 'cause your friend died and you wanna conjure up a monster that you can fight so you can save everybody and not feel so helpless?
Giles: Cordelia, have you actually ever heard of tact?
Cordelia: Tact is just not saying true stuff. I'll pass.
Willow: I'm good at medical stuff, since Xander and I used to play doctor all the time.
Xander: No, she's being literal. She used to have all these medical volumes, and diagnosed me with stuff. I didn't have the heart to tell her she was playing it wrong.
Willow: Wrong? Why? How did you play doctor?
Buffy: I... never have.
Xander: Man, Buffy! My whole life just flashed before my eyes! I gotta get me a life!
Willow's "frog fear" (which was first mentioned in the "What's My Line?" episode) appears again in this episode.
Buffy's cousin Celia, who died in a hospital when Buffy was eight, is the first relative of Buffy's other than her mother and father to be mentioned in the series.
"Killed By Death" was originally written as a first season episode where Buffy gets sick and Angel takes her to the hospital.
From the flashback scenes of Buffy as a young girl, we discover that, lo and behold, Buffy is not a natural blonde.
Killed by death
The title may be an illusion to the Motörhead song by the same name.
Buffy: Power Girl to the rescue!
Power Girl is a DC Comics superheroine. Created in 1976, she stood out among many other female heroines (a common cliché among female superheroes, is that they take names and sometimes costumes of pre-existing male superheroes), as while she was a cousin of Superman, she chose to create her own name, identity and costume, to keep herself seperate from her famous cousin, not wanting to be seen as his carbon copy (even refusing to wear anything remotely similar to his symbol). In her civilian life, she's Karen Starr, founder and CEO of her own multi-million dollar corporation, Starrware Industries.
Xander: Yeah, but if I see a floating pipe and a smoking jacket, he's dropped.
Xander's line is in reference to the classic movie, The Invisible Man, in which the invisible man from the title wears a smoking jacket, sunglasses, and carries around a pipe.
Visual: Der Kindestod's appearance and reference to first victim Buffy knows of
Der Kindestod is certainly reminscent--in both appearance and modus operandi--of Freddy Kruger, the monstrous spectre who hunts kids and teenagers in their dreams in The Nightmare on Elm Street series of films. Further, the child Der Kindestod killed the first night Buffy was in hospital was named Tina; Freddy's first victim was also Tina.
Xander: And if he asks you to play chess, don't. The guy's, like, a whiz.
Xander is talking about Ingmar Bergman's 1956 masterpiece The Seventh Seal, which tells the story of a weary knight named Antonius Block (played by Max von Sydow) who is challenged by Death to a chess match, the stakes being his life.
Title: Killed By Death
This may be a reference to the 1976 film Murder By Death, a parody of murder-mystery movies written by Neil Simon and starring David Niven, Peter Falk, Maggie Smith, Peter Sellers, and several other famous players.
Buffy: Well, Sherlock.
Sherlock Holmes is the famous fictional detective in the works of Sir Arthur Conan Doyle.
Xander: Of Rogaine boy?
Rogaine is the brand name of an hair growth medicine. Xander refers to the balding security guard.
Giles: Cordelia may be Homerically insensitive, but she may also be right.
From the Greek epic poet Homer. Homerically is an adverb meaning of epic proportions.
Cordelia: She came in looking for the Gwenyth Paltrow, and it looked more like the Mr. Potato Head.
Gwenyth Paltrow is the American actress. Mr. Potato Head is the childs toy with exchangable body part. Mr. Potato Head's nose is considerably more bulbous than Ms Paltrow's.
Xander: This is not the time to challenge Angel for the Ultimate Fighting Championship.
The Ultimate Fighting Championship is a no-holds barred martial arts tournament noted for its extreme violence.