The intro starts with a reference to Night Of The Living Dead with a lot zombies and shooters, then chief wiggum turns into a cyclops which a reference to the voyage of Sinbad, then we see Bart Simpson writting all work and no play makes Jack a dull boy which is a reference to The Shining then we see reference to Hellboy, then Homer turns into an alien from Blade 2, then we see the buried version of the 1987 Simpsons and Godzilla then Marge is Mimic a movie from Guillermo Del Toro and Lisa with The Phantom Of The Opera, and we see different treehouse of horror such as xix, i, xiii and ix we see cthulhu and a final reference to Pan's Labyrinth, the first segment starts with a reference Oh The Places You'll D'oh which is a reference to The Cat In The Hat and Oh The Places You'll Love, the second segment Dead And Shoulders after Bart gets his head cutted off and lives with the body of Lisa Simpson and the last segment Freaks No Geeks which is a reference to the movie Freaks after Homer becomes one of them. Then the ending sounds like How I Met Your Mother and the ending sounds like a mixture of treehouse of horror xix and xvi from 2008 and 2005 and Gracie Films says one of us.
Review of Treehouse of Horror XXIV
