Big-Lipped Alligator Moment: The iconic zombie dance sequence counts as one - it comes in the middle of the music video's plot out of absolutely nowhere, featuring no explanation to why Michael Jackson turned into a zombie (as he isn't shown being bitten) and why the girl isn't. The zombies, which were earlier shown having typical Zombie Gait, are somehow able to pull off elaborate dance moves in unison, while the girl is absent from the scene. In the midst of this, there's Michael's Unexplained Recovery to turn back into a human - another BLAM within a BLAM. Once the scene ends, the girl is back, Michael is a zombie again, and nobody acknowledges that the scene ever occurred. This doesn't stop it from being one of the best scenes recorded in a music video, though.
Even Better Sequel: Jackson's fifth album Off the Wall was already the best selling album by a black/Afro-American artist ever, but his second album, "Thriller", grew out to be the best-selling music album of all time! In terms of album sales this is certainly an improvement.
Fridge Brilliance: By saving all the choruses for the big dance number, it gives the video an unbelievable momentum. It's 14 minutes long, but it doesn't feel like it.
Michael invokes the MST3K Mantra when he and the girl leave the theater. It may be necessary to apply it to the whole video.
Memetic Mutation: One of the great pre-internet ones, the video popularized the concept of dancing zombies in pop culture, and even today if zombies dance, odds are they're doing something at least highly reminicent of the Thriller Dance.
And then in internet forums, a GIF image of Michael eating popcorn in the theater is used a lot, as a way of saying Pass the Popcorn below in a thread.
Mutually Fictional: Jackson watches a horror movie with his girlfriend starring two actors who look exactly like them, except for their clothes. Nobody comments on the fact that they are the same person. Even the people in the movie theater!
Narm Charm: The title track is a campy post-disco song celebrating Jackson's love of '50s B-movies. It's cheesy, it's got goofy lyrics, and it's one of his best songs.
Suspiciously Similar Riff: According to Daryl Hall, Jackson apparently admitted to lifting the bass line of "Billie Jean" from Hall's "I Can't Go for That (No Can Do)". Hall wasn't bothered, telling Jackson he himself had lifted it from somewhere else. Jon Anderson of Yes also felt "Billie Jean" was inspired by a track he recorded with Vangelis called "State of Independence", but considered it an example of "cross-pollination in music" and wasn't bothered either: they took the riff and made it funky. Quincy Jones produced a 1982 Donna Summer cover of "State of Independence" (with Jackson on backing vocals) that was a hit, so Anderson's assessment about cross-pollination seems accurate.
Tough Act to Follow: This album was and still is the best-selling musical album in history. How could anyone surpass it in commercial terms? Even Jackson himself couldn't.
From the Boris Karloff series
Complete Monster: "The Incredible Doktor Markesan": Uncle Konrad Markesan is a scientist whose own genius allowed him to return from the dead using a formula derived from the mold found in graves. In rage at his former colleagues at Penrose University disbelieving his theories, Markesan revives them after their deaths, spending each night torturing and tormenting the three, forcing them to relive their "crimes" against him as they suffer in pain from being revived while begging him to be allowed to die. When Markesan's nephew Fred and his wife Molly surprise him, Markesan allows them to stay, but plots to dispose of them as well. Capturing Fred at the end, Markesan plans to murder him and it is only after he is killed for good that Fred discovers Markesan has already murdered Molly and transformed her into one of his undead slaves.