Sailor Mouth / Artist Unknown - S2-E15
Continuity mistake: "In Artist Unknown", when Spongebob creates the statue, the right arm of it is tucked behind it's back and the left arm is bent with the hand resting on the chin. When the art collector jumps onto the head to remove the nose Squidward placed on it, the arms are switched so that the left arm is behind and the right hand is up on the chin. Then, when the art collector carries the statue out, the arms are back in their original positions.
Sailor Mouth / Artist Unknown - S2-E15
Continuity mistake: In "Sailor Mouth" when Spongebob starts cussing in the Krusty Krab, a sailor and a pirate make a comment, but when everyone leaves the Krusty Krab, the sailor and pirate are nowhere to be seen.
Answer: I believe this is the Season 6 episode "Spongicus".