Blinded by the Light: Prince Daring advices people to cover their eyes, look away, or have some VERY dark shades on hand whenever he smiles.
Cassandra Truth: In "Maddie's Hat-Tastic Party" Cerise reveals her wolf ears, but everyone thinks their fakes for Maddie's tea party.
Continuity Nod: Apple corrects herself and says she is the student council co-president alongside Maddie in The Unfairest of Them All.
Contrasting Sequel Main Character: Frankie is naive and peppy due to a lack of life experience at all, Raven is cynical due to a life where she's been treated as the bad guy. There are other contrasts too, like how the headmaster in Monster High is the Big Good and the one in Ever After High is the Big Bad.
Crapsaccharine World: Sure, it's a fairytale world with happily ever afters around every corner...if you're a character who's supposed to get one. Otherwise you're supposed to fill your role even if it leads to your own personal ruin. The Rebels clearly see it as this and want to change things.
Darker and Edgier: Is ironically this to Monster High. Ever After High has an overarching plot involving really dark looks at destiny, fate, and the notion of "happily ever after". Look at their first major conflicts. Monster High's is about the Fearleading Squad competition. Ever After high has it's main character having to weigh possibly being erased from existence and starting a conflict that may doom multiple stories.
The aesthetic, however, is clearly Lighter and Softer, putting it on both sides of the idea.
Designated Villain: Raven Queen In-Universe, as she's the daughter of the Evil Queen from Snow White. She resents this deeply and wants to be seen as the good person she really is.
Do Not Go Gentle: The majority of Briar Beauty's antics and interactions with others usually involve her "living it up" before her hundred-year slumber.
Early-Bird Cameo: You can spot Kitty Cheshire and Lizzie Hearts in the background of the pilot.
Elegant Gothic Lolita: Lolita fashion seems to have inspired most of the girls' outfits, if they're not outright wearing lolita.
Everything's Better with Princesses: Not only used normally (with many important characters being princesses), but taken as truth in-story. Even more than regular "good guys", princesses tend to have extra pull and privilege in the school, getting their pick of classes and being allowed to serve on the student council.
Facepalm: Raven does this at the end of Replacing Raven, when one of the three little pigs decides to become a 'balloonatic' instead of evil, thus ruining Raven's chance of getting a replacement for her role in Snow White.
Friendly Enemy: Unless dealing with the issue at the heart of the matter, that is the nature of their destinies, the Rebels and Royals can get along quite well. Apple is actually more disappointed that her "frienemy" Raven isn't acting "enemy" enough.
Generation Xerox: The point of Ever After High. Descendants are to relive their parents' stories, whether they like it or not, and this has happened over and over.
Appropriately, Lizzie Hearts is shaping up to be this. Her mother is even worse, having gone completely off her rocker even for a Queen of Hearts and causing their world to be declared a hazard area. Though it's actually Raven's mother's fault.
Grey and Gray Morality: Both the Rebels and Royals are not shown as evil or unjustified. Both sides have valid points in their argument about destiny.
This is further shown by people on one side of the debate leaning toward the other for different reasons. Briar Beauty and Cedar Wood being the best examples.
Mad Oracle: Giles Grimm has, in addition to being trapped in the Vault of Lost Tales, been cursed to speak only in riddles that make no sense. Naturally, Maddie knows what he's really saying.
Magitek: The students have magic mirrors that seem to fulfill the same function as the Internet. Students have "mirror blogs" which look a lot like Facebook feeds. Blondie Lockes carries a mirror the size of a tablet computer, unlocked by sliding her finger along a padlock icon.
Man in the Iron Mask: Milton Grimm trapped his brother Giles in the basement and cursed him to be unintelligible.
Mythology Gag: Plenty of elements from the original stories are incorporated into the characters as jokes. Examples include:
Baba Yaga's office having chicken legs.
Mr. Piper's playing summoning a swarm of rats.
Professor Rumpelstiltskin's "extra credit" being spinning hay into gold for him.
Coach Gingerbread Man emphasizing the importance of knowing how to run properly and quickly, especially if someone is trying to eat you.
In the novel, Maddie ends the Wonderlandian pet summoning dance with "Oh, frabjous day!"
Necessary Evil: It's literally necessary that certain students turn out evil for the stories to go on as planned. Raven's whole plot is that she doesn't want to be evil while Apple's is about how without Raven, her story lacks a villain and therefore cannot go on as planned.
Official Couple: Ashlynn Ella and Hunter Huntsman. They're so official that their dolls come together in the same package. You literally can't have one without the other.
Punny Name: It's a Monster High spinoff, of course.
"Rashomon"-Style: The two-part pilot, with one episode from Apple's POV and one from Raven's. Interestingly, the scenarios change in the intros. For instance, in one, frog!Hopper is kissed and turns back into his human form, while in the other, he is rejected and turns back into a frog.
Also after Legacy Day, when we first see the split between the Royals and Rebels take hold. The Royals seemingly remember Raven as ranting about how if she doesn't get the story she wants nobody should, while the Rebels recall Apple sounding borderline dictatorial about how everyone has to do what the story tells them. Neither is what actually happened, but it does a great job is illustrating both groups' standpoints.
Royal Rebel Revolving Door: Dexter Charming is officially a Royal and tends to support them, but when Raven is involved he seems to skew more Rebel.
Wham Episode: The Tale of Legacy Day where we finally see the official split between the Royals and the Rebels.
Wild Card: Quite a few characters are neither Rebel nor Royal. Dexter is officially a Royal, but expresses some rebellious attitudes in his mirror texts, and so is classed with neither on the character page. The Frog Prince is often seen with the Royals, but likewise tends to go along with Rebel plans like Cupid's True Hearts Day party. Kitty is also often shown with the Rebels in group shots but is really The Gadfly who will mess with either side as she wants.
You Can't Fight Fate: The reason Ever After High exists in the first place is to ensure even the children follow their parents' legacies.
Your Approval Fills Me with Shame: Ashlynn starts questioning her True Hearts Day choice because not only are her friends concerned about her choice, but Duchess thinks it's a great idea. In the end she decides it doesn't matter and goes Rebel anyway.
Raven feels like this every time her mother shows pride in, or approval for, Raven and her actions.