Visible crew/equipment: In the scene where they get in Eddie's new car watch Raven get into the car, her left foot kicks a some sort of power outlet on the ground with a lot of plugs in it. Judging from the direction of the cords they seem to go to the camera or other equipment. They wouldn't have put a power outlet there for set decoration.
Visible crew/equipment: When Cory is telling his dad that he doesn't want to trick or treat with him anymore, you can see studio lights in the head mirror that Mr. Baxter is wearing around his head.
My Big Fat Pizza Party - S2-E21
Visible crew/equipment: When Raven is making snow angles in the giant pizza, watch as Chelsea says, "They're beautiful!" There is a very visible boom mic.
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