* ActorAllusion: Creator/ErinFitzgerald, who voices Elle Eedee, "voices" [[Characters/LeagueOfLegends Sona]], another blue haired popular musician/DJ.
* DevelopmentHell: A LiveActionAdaptation musical was planned for 2012. The musical part got carried to the 2015 CG movie ''Boo York, Boo York'', and the live-action part is now slated for a movie fall 2016.
* FanNickname: Sixties Chick and Scary Lou for Scarah, Lala for Draculaura, and [[Series/DinersDriveInsAndDives Guy Fieri]] for Heath.
* FollowTheLeader: With the line being a top seller, you bet there are imitations. MGA, before they took a break to rebrand Bratz, expanded the line with Bratzillaz, the witch "cousins" of the Bratz. They're best to copy MH in presentation - a quick check of the Bratzillaz Youtube channel had webisodes and a live-action music video. FandomRivalry was strong here.
** Novi Stars: MGA's line of dolls with an alien gimmick and Punny Names. They're also following the music video and webseries trend.
** Playhut came out with Mystixx, which copy the look of the Monster High dolls (with some possible recasting of the Mattel molds) and features some possibly traced character art.
** Midnight Magic, a line of multi-colored witch dolls found mostly at discount stores, and a slew of various bootlegs and copycats coming from China.
** WesternAnimation/MyLittlePonyEquestriaGirls is WesternAnimation/MyLittlePonyFriendshipIsMagic getting a Monster High-like makeover.
** Even comics can't resist, as Franchise/TheDCU now has its own line of various female characters going to high school(in all fairness however, DC was pushing for that to happen even well before Batman Beyond was created- but likely went ahead now thanks to other similar lines being successful).
** Of course, Monster High itself wasn't exactly immune to this... more than a handful of people have brought up strong similarities between the series and ''Scooby-Doo and the Ghoul School''. THEN there is the matter of the Japanese manga ''Hells Angels''(2002) and its anime adaptation ''Hells''(2008)(both spun off from the Japanese action figure line ''Resurrection of Monstress''(1999)), which is the same concept of monster girls going to school(albeit a school in Hell), only with ''far'' more skin showing.
** There is another, completely unrelated movie [[Creator/AllisonPregler Obscurus Lupa]] reviewed called ''Monster High'' (that predates the franchise by almost 20 years) which contains gory shots of people exploding and gratuitous amounts of RapeAsComedy. Pray that an unwitting parent hasn't confused the two.
** Shortly before the series debuted, a children's book titled ''Frankie Stein'' was published, about a young boy monster built much like the Frankenstein monster.
** Deliberately invoked in-universe with Dracula- Draculaura's adoptive father is NOT the well-known Dracula. Vlad the Impaler took the title for himself several centuries after this Dracula served the Roman Empire. The two did have a conflict over it.
** Deuce, starting with the "Why Do Ghouls Fall in Love?" special, is now voiced by newcomer Evan Smith. Smith also replaced Yuri Lowenthal as the voice of Gil. Cam Clarke filled in as Deuce's VA until Evan was cast. The vocal change also marked a [[SameCharacterButDifferent change in his personality]] that not everyone agrees with.
** Clawd was initially voiced by Yuri Lowenthal for "Fur Will Fly" for only one line; he's currently voiced by Ogie Banks.
** Heath was voiced by Yuri Lowenthal in Season 1, but Cam Clarke voices him in Season 2.
* TalkingToHimself: Since there are more characters than voice actors, this happens a lot.
** Audu Paden voices Manny, Slo-Mo, and Ghoulia.
** Salli Saffioti voices Cleo and Clawdeen.
** Erin Fitzgerald voices Abbey, Cupid, Rochelle, Scarah, Spectra, Clair, Fawn, Wydowna, and Elle.
** Evan Smith voices Deuce, Invisi Billy, Garrott, Gillington, Rocco, and Thad.
** Cam Clarke voices Heath, Hoodude, and Mr. Rotter.
** Cindy Robinson voices Gory, Holt, Jackson, Madame Ghostier, Operetta, and Lux Ptolemy.
** Laura Bailey voices Bloodgood, Lagoona, Honey, and Skelita.
** Stephanie Sheh voices Jinafire and Jane.
** America Young voices Toralei, Howleen, and the werecat twins.
** Kate Higgins voices Frankie, Iris, Lilith, and Casta.
** Jonquil Goode voices Clawdia, Gigi, Djinni, and Twyla.
** Haviland Stillwell voices Avea and Vandala.
** Paula Rhodes voices Iris and Sirena.
* ShowAccuracyToyAccuracy: Most of the time, the dolls are pretty good representations of their depictions in their character art, the webisodes, and the movies, but usually their faces are much milder. Some more notable inconsistencies include:
** Gil's dolls have a layer of head scales to simulate shaved hair around his fin "hair", similar to Deuce and some scales on his chest. However, the cartoon version has a completely smooth head and chest. Gil's also lacking a doll of his signature outfit, due to his limb fins preventing him from wearing long sleeves and pants.
** The CGI art on Kiyomi's box gives her a pink hair accessory and silver chain earrings similar to her belt. The doll itself has a sea green hair accessory and simulated pierced ears, but no earrings.
** Animated Toralei's face is in two different shades of orange. The physical dolls give her only the darker shade.
** Spectra's dolls tend to look off, thanks to the stoic expression and totally straight hair as opposed to the constant cheerful smile and unkempt hair.
** Animated Elle's hairline is a squared-off widow's peak to keep with her angular robotic details. The actual doll's hairline is completely smooth.
** A detail that almost made it: Posea's animation model and artwork have gills on her face, but this feature never made it past the physical doll's prototype.
** The artwork for Gigi's "School's Out" doll gives her a parted hairstyle and a small section of visible midriff. The doll's hairstyle is a ponytail, and her outfit is one piece.
** Twyla's Freak Du Chic artwork lacks the fishnet sleeves that the doll's outfit has.