Treehouse of Horror III/References

Homer walking into Alfred Hitchcock's silhouette is a parody of Alfred Hitchcock Presents.
In the Halloween party, Bart is costumed as Alex DeLarge from A Clockwork Orange.

The title is a wordplay on the 1961 drama film Town Without Pity.
The segment is a spoof of Twilight Zone episode "Living Doll".
Homer sings the Oscar Mayer jingle "My Bologna Has a First Name", spelling his name ("H-O-M-E-R") in place of O-S-C-A-R and M-A-Y-E-R.
When Marge calls the doll manufacturer for help, the on-hold music is "Everybody Loves a Clown".

King Kong: Spoofed and parodied throughout the segment.
The advert above the one that Marge answers consists of lyrics from "Escape (The Piña Colada Song)".
When the gas grenade explodes in front of Mr. Burns, he sings "I was strolling through the gas one day", parodying the song "The Fountain in the Park". (The song's first line is "While strolling in the park one day".)
Shirley Temple is seen dancing and singing her signature song "On the Good Ship Lollipop" before King Homer eats her.

The segment's title is a reference to the Alfred Hitchcock film Dial M for Murder.
When Bart raises the dead, he's wearing a Michael Jackson record on his head (aptly, it's Thriller).
Bart's dead-raising incantation consists of the names of game show hosts and department stores:
- "Cullen" - Bill Cullen
- "Rayburn" - Gene Rayburn
- "Narz" - Jack Narz
- "Trebek" - Alex Trebek
- "Zabar" - Zabar's
- "Kresge" - The S.S. Kresge Corporation, which became Kmart
- "Caldor" and "Walmart"
Homer kills the following famous zombies: George Washington, Albert Einstein, and William Shakespeare.
Three of the tombstones in the Pet Cemetery read "Fish Police", "Capitol Critters", and "Family Dog", the titles of three short-lived animated television programs that aired in the early 1990s.
When Bart attempts to return the zombies to their graves and accidentally turns Lisa into a snail, the incantation consists of the names of 1970s TV detective shows and their main characters: Kolchak, Mannix, Banacek, and Danno (Hawaii Five-O).
The incantation that successfully returns the zombies to their graves consists of condom brand names: Trojan, Ramses, Magnum, and Sheik.

Continuity

In the couch gag, skeleton Marge's hair are the same as her hair in "Treehouse of Horror II"'s opening scene.

It is the first episode in the series of Treehouse of Horror episodes to have a zombie-related segment. The second is "The Fright to Creep and Scare Harms" in "Treehouse of Horror XIII".
Bart appears in 'A Clockwork Orange' costume dress as 'Alex DeLarge'.
This was also the first Halloween episodes to have a couch gag.
This is one of several Simpsons episodes which are considered anthology episodes that features mini-stories.
In the scene where Bart attempts to resurrect Snowball I, human zombies arise from around them, despite them being in the pet cemetery. This could be as some citizens might be cheap and classify their recently deceased under pet.
Costumes at the Halloween party:

When Homer is escorting the family out of the house to escape the Zombies, he leaves the door wide open, but in the very next shot it is shut.
In "Clown Without Pity", when the Krusty doll accidentally knocks the head off of Lisa's Malibu Stacy (her doll), Krusty puts it back on but a crack is not shown where the head came off.
In "Dial Z for Zombies", Homer is shooting zombies with the shotgun at the school. When he shoots the first two he just shoots them twice. Every other zombie he shoots requires him to slide the gun. It doesn't when he shoots the first couple of zombies.
When Lisa is turned into a snail in Bart's zombie story, she says "awww", but her mouth doesn't open.

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Kamp Krusty • A Streetcar Named Marge • Homer the Heretic • Lisa the Beauty Queen • Treehouse of Horror III • Itchy & Scratchy: The Movie • Marge Gets a Job • New Kid on the Block • Mr. Plow • Lisa's First Word • Homer's Triple Bypass • Marge vs. the Monorail • Selma's Choice • Brother from the Same Planet • I Love Lisa • Duffless • Last Exit to Springfield • So It's Come to This: A Simpsons Clip Show • The Front • Whacking Day • Marge in Chains • Krusty Gets Kancelled