Grey Griffin's credits include "Wormian #1," a leftover credit for The Fast and the Wormious (2003).
Thorn's eyes are either black or green in different scenes. She may have changed her contact lenses as part of her stage makeup.
When Daphne is attacked in the middle of the night, she happens to be the only one dressed for bed.
Daphne says that the argument between the Hex Girls is because Dusk is rumored to be leaving, but the front cover to Popular Magazine implies that it is Thorn who's walking out, by separating her from Luna and Dusk (which makes more sense her being the lead singer and all).
Shaggy's knowledge of geography is a bit shaky, as he seems to imply that Bavaria (a German state) and Transylvania (a Roman-Hungarian geo-cultural region) share a border, which is not true. Since 1945, no part of Germany borders either of those countries.