As Howleen is walking outside looking for good uses for her wishes, she passes by Rochelle reading a letter and holding a rose petal. These two things are from Garrott DuRoque, with whom she reunited in "Scaris: City of Frights".
Scarah and Invisi Billy are described as an item, which they are shown to become in "Scarah-Voyant". That webisode did not air until two months after "13 Wishes" premiered, but chronologically comes first.
Whisp's motivations and her fragile bond with Gigi are more fully explained in Gigi's 13 Wishes diary, which pays more proper attention to Whisp feeling disposable compared to Gigi.
There is little consistency in the scope of Howleen's wishes. For instance, her popularity, student disembodied president, and headmistress wishes reduce almost the entire student body into mind-controlled slaves, but "randomly" do not affect various characters. Why the effects of these wishes differ so greatly is not explained. Howleen's wish to undo her previous wishes also has inconsistent effects. For instance, the Howleen masks all disappear on the 12th wish, but none of the 13 Wishes: Haunt the Casbah outfits are changed for 'Signature' outfits, despite them being a direct result of Howleen wishing the girls banished to the lantern. Particularly peculiar is the Die Trying un-wish. Clawd, Manny, and Heath are just pulled from the show, but they have been on it nonetheless, as proven by Spectra's interview and Crash's presence at the party.
When Draculaura is doing Abbey's makeup in the washroom, none of her is seen in the mirror; her clothes should show up.
After telling the story of how Whisp came to be, Clawdeen closes the book. When the screen zooms out, it is somehow open again.
When Howleen is reading Cleo's invitation, both her ears are upright.
Scarah's 3D model is based on her San Diego Comic-Con International 2011 prototype rather than the 2012 exclusive doll. For instance, she has the broader cheeks and the jacket of the prototype. This is a tad curious, considering Wydowna's 3D model, whose history is largely alike but for the fact her doll didn't come out until 2013, is based on her actual doll.
Gory's 3D model is updated from its backgrounder-ish previous look to resemble her 2D model more.
"13 Wishes" technically has three release dates: It premiered in English in the UK during the weekend of September 21st and 22nd. It became available for download on September 26th on websites like iTunes. The DVD was released on the 8th of October and the movie aired on television on the 25th of that month.