Plot hole: In "Once Bitten", Mr. Krabs never unlocks the doors to the Krusty Krab, but at the end of the episode, Squidward enters with no problem.
Continuity mistake: In "Once Bitten", Mr. Krabs is holding a key, about to unlock the doors to the Krusty Krab, when a customer stops him. Two shots later, the key is missing from his hands.
Continuity mistake: In "Once Bitten", there is a keyhole on one of the doors to the Krusty Krab. Several shots later, the keyhole disappears.
Continuity mistake: In "New Leaf", When Mr. Krabs throws Plankton's snow globe in to the room, there is no lock. In the next shot, there is.
