So here's my guess so far:
Coach = Poltergeist
Craig T. Nelson, who played the father in Poltergeist, also played Coach Hayden Fox in the show Coach.
Coach may also be Clue #4
Dynamite = Trick 'r Treat (Clue #2)
Don't really need to explain this, do I?
Feature = Most Likely Secret House (Special Feature?)
Fireball = Stranger Things (NO clue)
Meteor = Original (Clue #6 or 7)
Poison = Original (Clue #5 or 6)
Rag-tag = Cult of Immortal (or Undead) Carnies (Clue #3)
Clue #3's rule was elements of the story; assuming that it meant finding a key specific piece of the story each R&M gif was referring to, I watched each scene of the episodes they belonged to.
Part 1 - The "backwards savages" referred to the cult of tree-people that Morty joined when he and Rick were stranded in the mini-mini-mini-verse.
Part 2 - Rick's "Good One Jerry" referred to the "Insane Clown Posse" joke Jerry made.
Part 3 - The main key piece of the plot during the episode was the "Immortality field" that Rick and Jerry inadvertantly destroyed while escaping from alien hitmen.
Adding up all of those pieces leads you to a savage group of immortal, insane, clowns. When you hear savage group/cult of clowns, you tend to think "Carnies," and the codename "rag-tag" fits that term nicely. Usually in horror, people tend to associate immortality with "undead" and by that extension 'graveyards." Therefore, it's probably an Undead Carny Graveyard.
Snacks = Return of ANDI? (Clue #8?)
Surprise = Happy Death Day or Secret House
Zero = Dead Exposure: Patient Zero (Clue #1)
- I think either "Meteor" or "Poison" might be the returning original of Scary Tales: Wizard of Oz, which I'm sure is Clue #6 from all the speculation in the past 1-2 pages.
- Clue #7's Name is Nihilism, and its rule is "Sleight," meaning deceptive. Maybe it's not on the clip or the scene its in, or even the plot of the episode itself. The episode the GIF belongs to is titled, "Big Trouble in Little Sanchez." The title is a play on the movie "Big Trouble in Little China," which was directed by John Carpenter, whose movies had a consistent theme of nihilism, especially in his cult classic version of "The Thing." Now it might seem unlikely given the rumors this time around (and the info I was given, whose main sources seem to be quite reputable), so maybe it's an original version of it?
I'll edit this every now and then.