* 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.
** Creator/YuriLowenthal as Deuce, Creator/LauraBailey as Lagoona, Debi Derryberry as Draculaura, and Katie Higgins voicing Frankie. As of Season 2, Creator/CamClarke does the voice of Heath Burns and Hoo-Dude.
** Nefera De Nile is a very bitchy version of [[Anime/CowboyBebop Faye Valentine]].
** Cindy Robinson, who voices Operetta and Lux Ptolemy, will go on to voice [[Anime/SailorMoon Sailor Moon's Queen Beryl]], and Stephanie Sheh, who voices Jinafire Long, will go on to voice the Moon Princess Usagi herself.
** [[VideoGame/SaintsRow Warren Williams]] is now a teen werewolf, Clawd Wolf.
** [[Anime/SoulEater Death The Kid]] is now Porter Geiss, a ghost with a penchant for graffiti.
* NamesTheSame: There is another, completely unrelated movie [[Creator/AllisonPregler Obscurus Lupa]] reviewed called ''Monster High'' (that predates the franchise) which contains gory shots of people exploding and gratuitous amounts of RapeAsComedy. Pray that an unwitting parent hasn't confused the two.
** 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: In Season 1, Yuri Lowenthal did the voice of every teenage male character. Post season 2, the male voice cast has expanded (but not by much)
** Audu Paden voices Manny, Slo-Mo, and Ghoulia.
** Salli Saffioti voices Cleo and Clawdeen.
** Erin Fitzgerald voices Abbey, Cupid, Rochelle, Scarah, Spectra, Clair, Fawn and Wydowna.
** 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, and Lilith.
** Jonquil Goode voices Clawdia, Gigi, Djinni, and Twyla.
** Haviland Stillwell voices Avea and Vandala.
** Paula Rhodes voices Iris and Sirena.