Continuity mistake: When Chelsea drinks all the punch, you can see that her face is soaked. The next shot you see of her, her face and hair are dry.
Continuity mistake: When Cory is talking to his dad about not trick or treating with him, look at his barbell. The number "one" written on it keeps appearing and disappearing between shots.
My Big Fat Pizza Party - S2-E21
Continuity mistake: When Chealsea and Raven are making the giant pizza, the pepperoni slices Chealsea throws on the pizza are normal sized, but when they come into the dining area they are giant.
Answer: Psychic ability run in Raven's family, while the abilities skipped a generation with her mother, her Grandmother Viv was also a psychic.
OneHappyHusky