Continuity mistake: When Shake, Frylock, and Meat Wad return from Memphis, they notice the door of their house has been ripped out and knocked onto the yard (Meat Wad even makes a comment about it). But as they walk inside to Mothmonsterman, the door is back on the hinges were it should be.
Master Shake: You're about to not have a mouth! And I mean it! I'LL RIP IT OFF.