Pineapple Fever/Chum Caverns - S6-E23
Continuity mistake: In "Pineapple Fever", while Spongebob and Patrick are protecting themselves from the elements, the nails and boards on the floor change positions in almost every other shot.
Pineapple Fever/Chum Caverns - S6-E23
Continuity mistake: In "Pineapple Fever", Spongebob re-scrambles the jigsaw puzzle right in front of him and Squidward runs outside. In two shots, when Squidward returns, the jigsaw puzzle pieces have moved to the left on the screen, almost behind Spongebob.
Answer: I believe this is the Season 6 episode "Spongicus".