When Homer says to the Devil that if he eats what's left of the donut he is going to be in Hell, the remains have some pink cream and sugar. When Homer eats it, however, the pink cream and the sugar disappear.
Terror at 5½ Feet
When the camera zooms at Bart and Lisa talking, the bowl Marge is holding and the bowls on the table are empty. But when Marge puts the bowl on the table, the bowls are full of cereal and oatmeal.
Also, the bowl Marge was holding doesn't have a spoon on it. But when she puts it on the table, a spoon appears on it.
When the camera zooms in as Bart starts eating, there is a bowl of cereal with a spoon beside Bart's bowl. But when the camera zooms on the family, the bowl and the spoon disappear.
In the scene of the family and Homer holding the objects he found on the pier, Bart has his hands on the table. But in his closeup, he has one hand with a spoon of cereal.
Bart and Lisa do not have backpacks when they enter the bus.
Uter is on the left side of the seat. But when Milhouse sits on the seat, Uter is on the right side of the seat.
When Bart opens the bus window everyone starts scamming and panicking but when Homer drives by to say hi, some of the children can be seen through the windows, sitting peacefully.
Bart Simpson's Dracula
In the news, Mr. Burns has some blood on the left side of his face. But when he licks the blood, the blood is on the right side of his face.
When Lisa opens the curtain, Janey, Ralph, Milhouse and Martin are not there. But in the next scene, they appear.
When Bart is about to bite Lisa, both of the bookshelves in her room appear empty.
When the family is ready to bite Lisa, Maggie has her mouth open with her fangs. But in a split second, a pacifier appears on her mouth.
It's possible it's a reference to Snoopy: At the end of A Charlie Brown Christmas, from 1965 to 1967, the closing singing of the lyrics to "Hark! The Herald Angels Sing" included Snoopy mouthing the words; this was corrected in 1968 for all subsequent broadcasts.
Marge says that she is the head vampire, but that should mean Lisa would be a vampire, too.
When Marge comes into Bart's bedroom, Maggie is not seen. But when Bart flies out the window she appears.
Even though the family (barring Lisa) were supposed to be vampires as a result of Marge biting them at some point, they don't disintegrate despite clearly being in the house during the daytime, with no blockages to the windows.
In the opening sequence the following tombstones can be read: "Elvis Accept It", "A Balanced Budget", "Subtle Political Satire", and "TV Violence", with several gun shots being fired at it.
The tombstone about Elvis is a reference to the conspiracy theory that Elvis is still alive.
At the beginning, the paintings that Bart passes by are Lisa in a version of The Scream, Marge's shadow on wall (in the style of de Chirico), Homer (Van Gogh's self portrait), Maggie with melted pacifiers (Dali's "Persistence of Memory"), Lisa playing sax (Picasso's "Three Musicians"), and Homer chasing Bart (Escher's "Ascending and Descending"). The final story that Bart passes is the paintings of Bart behind an apple (Magritte's self-portrait, "The Son of Man") and the "Dogs Playing Poker" picture.
This is a parody of Rod Serling's "Night Gallery".
The Devil and Homer Simpson
The demon who is feeding Homer donuts says: "I don't understand it. James Coco went mad in fifteen minutes!"James Coco was a character known in the 1970s. He parodied the Belgian sleuth Hercule Poirot, penned by Agatha Christie. In the movie, James Coco’s character throws a volley of subtle food jokes. In his last years, Coco received attention for his culinary talents and best-selling cookbooks. The James Coco Diet, an educational book which included chapters on menu planning and behavior modification as well as choice recipes, was just one that he promoted on the talk show circuit. It is probably not a coincidence that he often played characters with extreme food issues.
When the Devil Flanders gets angry at Homer at the nuclear power plant, the form he assumes is exactly like the demon Chernabog in the "A Night on Bald Mountain" segment from Fantasia.
Homer's ironic punishment of being force-fed donuts is a parody of the Merrie Melodies cartoon Pigs is Pigs. (The scene where Piggy is being force-fed is creator Matt Groening's favorite scene in animation.)
Lionel Hutz combs his hair the way Ariel combs her hair from The Little Mermaid.
Burns' manor being set in Pennsylvania is an obvious parody of Transylvania, Dracula's rumored living place.
The winding road up to the castle the front door opening by itself Burns materializing on the stairs Burns's clothing Burns's shadow having a life of its own. Plus it had those horrifying pointy fingers. The spookiness of the vampire Count Orlok's shadow was one of the best elements of the film "Nosferatu".