Krabby Land / The Camping Episode - S3-E19
Other mistake: In "Krabby Land", Mr. Krabs as "Krabby The Clown" finishes his short speech and goes into his office. When he slams the door, bubbles float up and those bubbles stay motionless in the air for a few frames.
Krabby Land / The Camping Episode - S3-E19
Continuity mistake: In "The Camping Episode", Squidward sets down a blanket to lay under the stars and in a couple of shots, the blanket disappears.
Krabby Land / The Camping Episode - S3-E19
Continuity mistake: In "Krabby Land", Spongebob goes to check his motivational quote and from far away, the page is flipped up. But in the next shot, it is a close up and the page is flat against the stack. In the following shot, the page is flipped up again.
Krabby Land / The Camping Episode - S3-E19
Continuity mistake: In "Krabby Land", Mr. Krabs is in his boat with Spongebob in front of the playground filled with children. After looking through a pair of binoculars, he drops them in front of the boat. However, in the next shot the binoculars are gone.
Answer: I believe this is the Season 6 episode "Spongicus".