Phantasma's father is the Phantom of the Opera but here he is portrayed as a ghost instead of as a disfigured human and he wears no mask.
Cartoon Network and Boomerang loved airing this film during the early 2000s, seemingly airing both this and Scooby-Doo and the Alien Invaders (2000) at least once a month.
The Ghoul School girls' fathers are famous Universal Monsters: Dracula, Frankenstein, the Wolf Man, the Mummy, and the Phantom of the Opera.
The little girl mummy name Tanis is also a city in the north-eastern Nile Delta of Egypt. It is located on the Tanitic branch of the Nile which has long since silted up.
It is implied that Sibella may be only half vampire: She can be outside during the day and is completely unaffected by sunlight, unlike her father.