You Wish ('Shanghaied') / Gary Takes A Bath - S2-E11
Audio problem: In the beginning of "Shanghaied" during the Patchy the Pirate segment, Patchy says, "Roll the cartoon" but his mouth obviously says something else.
You Wish ('Shanghaied') / Gary Takes A Bath - S2-E11
Continuity mistake: When Gary almost goes into the mud and his head is hovering over it, in the far shot, he is just sitting there.
You Wish ('Shanghaied') / Gary Takes A Bath - S2-E11
Continuity mistake: After Squidward comments about how the ship is dirty, he continues to climb up the anchor rope. Once he's out of the shot, the rope immediately changes color.
You Wish ('Shanghaied') / Gary Takes A Bath - S2-E11
Continuity mistake: When Gary goes through the pet door to run away from SpongeBob, when SpongeBob opens the door, there is no other side to the pet door.
You Wish ('Shanghaied') / Gary Takes A Bath - S2-E11
Continuity mistake: When Spongebob is talking about treasure to Gary, behind him is a door. If you look closely you can see a TV in the room, but when Spongebob and Gary enter the TV is replaced by a door.
You Wish ('Shanghaied') / Gary Takes A Bath - S2-E11
Deliberate mistake: Spongebob gets stuck in the top of a tree as Gary removes the ladder. In previous episodes it's quite clear that he's more than willing to 'fall' as he takes no damage when hitting the ground due to the low fall speed.
Pressure / The Smoking Peanut - S2-E12
Continuity mistake: When Sandy and SpongeBob are climbing the mountain at the beginning of "Pressure," when Sandy pushes the rocks down at SpongeBob, there were two big ones holding them that vanish. You could say that she pushed them down too, but remember that they were different colours than the smaller ones. (00:01:40)
Pressure / The Smoking Peanut - S2-E12
Continuity mistake: In "Pressure" right before they all jump on land Squidward has 6 legs, but when he gets on land he has 7 legs.
Pressure / The Smoking Peanut - S2-E12
Audio problem: In the beginning of "The Smoking Peanut", Spongebob takes his hat and spits it in the air like Clamu would do. Before he puts the hat in his mouth, he says, "a cannonball", the camera is on Spongebob and his mouth isn't saying that. He has his mouth open to put the hat in his mouth.
Pressure / The Smoking Peanut - S2-E12
Continuity mistake: After SpongeBob confesses he threw the peanut at the oyster, a zoo keeper says, "wait, here is the real criminal", and he drags out Mr.Krabs. If you look at his pockets you can see food, candy, and other junk. Yet when the zoo keeper accidentally rips Mr.Krabs clothes off the pockets are completely empty.
Pressure / The Smoking Peanut - S2-E12
Continuity mistake: In The Smoking Peanut, when Spongebob and Patrick are running in to see the oyster, Patrick is on the right, but in the next shot, he's on the left.
Pressure / The Smoking Peanut - S2-E12
Continuity mistake: Patrick's popcorn disappears completely after he drops it.
Pressure / The Smoking Peanut - S2-E12
Continuity mistake: In The Smoking Peanut, after Spongebob sees Sandy he runs home. When he's trying to open the door if you look to the right the ground is completely flat and has nothing in it. Yet when Patrick comes, while he is saying, "I followed these footprints to this exact spot", there are footprints.
Pressure / The Smoking Peanut - S2-E12
Continuity mistake: In the episode "The Smoking Peanut" At the end when the man holds up the pearl out of Mr. Krabs pocket, despite being surrounded by a stadium, the close-up of his hand shows complete blue sky in the background.
Pre-Hibernation Week / Life of Crime - S2-E13
Continuity mistake: When Spongebob has melted from stress and exhaustion, he is trying to talk and Sandy tells him to "hold that thought", and you can see the bike that they were riding, in the background. When she makes the fly fishing joke, the bike is gone, and there is a small plane. A few shots later the plane is gone as well.
Pre-Hibernation Week / Life of Crime - S2-E13
Continuity mistake: When his pants fall off when he's trying to hide, his pants are hooked to the plant by the brown part of his pants, but when Sandy comes looking and she sees his pants on the plant, they're hooked by the white part.
Pre-Hibernation Week / Life of Crime - S2-E13
Continuity mistake: When Spongebob and Patrick have run away, when they are fighting about the chocolate, Patrick has chocolate all over his mouth. Patrick says something like "I'll get there first" and starts running after Spongebob, and in the next shot his face is completely clean.
Pre-Hibernation Week / Life of Crime - S2-E13
Continuity mistake: When Spongebob falls off the sea needle, he lands on a . It shows his ripped off skin, then it shows his back with the piece missing, but the shapes are different.
Pre-Hibernation Week / Life of Crime - S2-E13
Continuity mistake: Sandy's bikini bottom is gone as she's bending over to paint the fence.
The Secret Box / Band Geeks - S2-E14
Continuity mistake: In Band Geeks during the Day Two scene, in the beginning you can see Pearl near the front, but in the distant shot that follows Pearl has moved further back. (00:04:20)
Answer: I believe this is the Season 6 episode "Spongicus".