James Lurie played the teacher Mr. Miller at Sunnydale High in the episodes I Only Have Eyes For You, Anne and Graduation Day (Part 1). You might remember him as the teacher who plays hangman with his class in Graduation Day (”They always go for the ‘E’”). James has also …

Brian Poth, who played ‘Fighting Boy’ in I Only Have Eyes For You, went on to play Tyler Jensen in CSI: Miami. He starred in Dean Quixote, which also featured Christopher Gorham, who played the doomed James Stanley in I Only Have Eyes For You.

Miriam Flynn, who played Ms. Frank in I Only Have Eyes For You, was the voice of Maa in Babe.

Xander says in Killed By Death, “If I see a floating pipe and a smoking jacket, he’s dropped”. This is a reference to The Invisible Man by H.G. Wells.

Xander calls the hospital security guard in Killed By Death, “Rogaine boy”. Rogaine is an American hair growth medicine.

The idea of people’s nightmares coming true in the episode Nightmares most likely comes from the A Nightmare on Elm Street movie series, in which villain Freddie Krueger has the ability to hurt people while they sleep.
The demon Der Kindestod in Killed By Death was clearly influenced by the …

When Angel arrives at the hospital in Killed By Death he is rather unsympathetically whistling ‘Ode to Joy’ from Beethoven’s ninth symphony.

Xander says about ‘Death’ in Killed By Death, “If he asks you to play chess, don’t even do it…the guy’s like a whiz!” This is a reference to Ingmar Bergman’s 1957 film The Seventh Seal, in which a Knight returning from the Crusades encounters Death, and stalls the Grim Reaper …

We discover in Killed By Death that Buffy is not a natural blonde. The girl who represents her as a child is a brunette, but future episodes (such as The Weight of the World) show young Buffy as a blonde.

Killed by Death was originally supposed to be a first season episode in which Angel brings Buffy to the hospital.

Willie Garson, who played the hospital security guard chatted up by Cordelia in Killed By Death, is best known as Stanford Blatch, Carrie’s gay friend in Sex and the City. He has also been in Groundhog Day, Things to Do in Denver When You’re Dead, The Rock, Kingpin, Mars Attacks!, …

James Jude Courtney, who played the Kindestod in Killed By Death, is also a stuntman. He has done stunts for Shelter, Executive Power, The Nurse, Widow’s Kiss and Girl in the Cadillac, and was the stunt double for Garibaldi and Gkar in Babylon 5.

Robert Munic played the Intern in Killed By Death. He appeared in (and was the casting director) for Stunt C*cks along with James C. Leary, who played Clem in seasons six and seven of Buffy.

Mimi Paley, who played the young Buffy in Killed By Death, has been in Malcolm in the Middle, Touched by an Angel, Early Edition and The X-Files episode ‘Closure’, in which she played Mulder’s sister, Samantha.

Denise Johnson, who played Buffy’s young cousin Celia in Killed By Death, has also been in ER. She did some voices for A Bug’s Life.