Riverdale:
Halloween Episodes inspired by Archie Horror. (Kind of like Simpsons Treehouse of Horror).
Meta Jokes, where one of the adult characters claims that people told him/her that he/she resembles the actress/actor, who portrays him/her.
Actually fleshing out the countless characters that were introduced throughout the Show.
Revealing what Sweet Pea’s real name is. We know his initials are NM, but we don’t know what NM stands for. (Personally I think his name might be Nathan.)
Chilling Adventures of Sabrina:
Lilith puts Mary in a Coma and lets her live the Life of her Dreams. (Like in the Comics).
The Weird Sisters wear private school outfits instead of the dark dresses with lace collars. (Like in the Pilot Draft.)
Agatha & Dorcas (getting better Character Development.)
Roz mentioning to Sabrina during Part 2, how she still remembers seeing Agatha & Dorcas in her Vision at Tommy’s funeral. (It could have happened at Sabrina’s Witch/Mortal Party.)
More Interactions between Sabrina’s mortal friends and her witch friends. (They happened in the Books, but it would have been better if they also had been in the Show).
Lilith doesn’t kill her Baby, but instead she lets him be Adopted by a Political Family. (Like in The Omen).