Factual error: In the episode "Mind Your Business," the saboteur sabotages Raven's business by pouring lots of kernels in the popcorn machine. However, the saboteur pours the kernels into the glass holding box instead of the pot, so the kernels would not have heated up enough to cause the popcorn mountain.
Other mistake: In "Out of Control", Eddie and Chelsea begin sharing notes in class. After Raven has picked it out of the trash, she reads what Eddie and Chelsea have put. Chelsea says, "Can't wait", but how could she? Eddie threw the note and it didn't reach her, just the floor, so Chelsea never read it nor make a reply.
Visible crew/equipment: In the episode Driving Miss Lazy, 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.