Revealing mistake: In this episode Dorothy and Blanche are awakened by a stench coming from the kitchen. After they go to inspect, we see that Rose is making some sort of Krispies treat. As you see her carry the plate to offer Dorothy and Blanch one, you can see that the plate is empty. And once they all start to eat them you can easily see that none of them are actually picking anything up and putting in their mouths.
Revealing mistake: When Dorothy and Blanche are in Rose's room, look at Baby. Its very obvious its just a stuffed toy pig. You can tell by the fluffy skin, the unnatural ear movement, and the covers would be moving up and down as its breathing. You can really tell its fake when Rose gets up off her bed.