When Hilda and Zelda arrive in Salem, the sound of squealing tires is heard when they stopped the car. The road is dirt, and tires only squeal on pavement.
In the beginning, Mrs. Hecht provides everybody with a character card, each saying Townsperson, saying that one person's says Witch. At the end she says the cards all said Townsperson, that she didn't create the witches, the students did. However, by claiming that someone got a witch card, she in fact *did* "create the witches", a detail which shouldn't escape a teacher.