Jellyfishing / Plankton! - S1-E3
Audio problem: In "Plankton" in the beginning, when Spongebob is outside with Mr. Krabs, Spongebob laughs. His laugh sounds different that how it does in the rest of the show.
Jellyfishing / Plankton! - S1-E3
Audio problem: In "Jellyfishing", in the beginning, when Squidward walks out of his house with his bike, Spongebob says "Hey, Squidward" but his mouth is saying something different.
Jellyfishing / Plankton! - S1-E3
Audio problem: In "Plankton!" when Mr. Krabs steps on the krabby patty, he replies with "this ain't no ghost" his mouth doesn't move at all.
Pizza Delivery / Home Sweet Pineapple - S1-E5
Audio problem: In "Pizza Delivery," when you see them being sucked towards the whirlpool (wide shot of whirlpool). Squidward says, "Let go of the pizza." several times before they actually get caught up in the whirlpool. But the time where he says the line and it automatically cuts to his face, when you see his face, it is the end of him saying the line so you hear, ".izza." You hear that, but when you see a close up of his face, his mouth is completely shut.
Mermaid Man and Barnacle Boy / Pickles - S1-E6
Audio problem: When Bubble Bass runs out of the Krusty Krab he is gasping and panting, but his mouth stays closed, his mouth doesn't even open a centimeter.
Sandy's Rocket / Squeaky Boots - S1-E8
Audio problem: In "Sandy's Rocket", when Sandy says "Aliens? Is that what this is about?" her mouth stops moving halfway into her sentence.
Sandy's Rocket / Squeaky Boots - S1-E8
Audio problem: When SpongeBob captures Mrs. Puff, her voice and the inflation sound are out of sync.
Culture Shock / F.U.N. - S1-E10
Audio problem: In "F.U.N.", Spongebob and Plankton both say "Eat 'em", but both of their mouth movements do not match the words.
The Chaperone / Employee of the Month - S1-E12
Audio problem: We see Spongebob in his long legs walk over to Mr. Krabs' house, then we see the door from inside the house. Through the window we see Spongebob's long legs, yet we hear him spring boing his way over when we see them already there.
Audio problem: In the scene where Spongebob is falling into Gary's dream, Spongebob is screaming for at least one second after he hits the ground.
Audio problem: In the episode "Rock Bottom" when Spongebob says "Another funtastic day at glove world," near the beginning, if you watch Spongebob's mouth, it only says "Another funtastic day at." It never says "glove world."
Your Shoe's Untied / Squid's Day Off - S2-E2
Audio problem: In "Your Shoe's Untied" when Gary ties Spongebob's shoes he says "hoppin' clams where'd you learn to do that?" When he says "clams" his lips are out of sync.
Mermaid Man and Barnacle Boy III / Squirrel Jokes - S2-E4
Audio problem: In "Squirrel Jokes" when Sandy is in the Bargn'-Mart and she can't decide which deodorant she wants, a fish says, "Maybe she should get both." His mouth says something else.
Grandma's Kisses / Squidville - S2-E9
Audio problem: After SpongeBob causes a flood in his grandma's house, he cries because he is fed up of being an adult and his grandma tells him he doesn't have to be a baby to get her love. When SpongeBob replies, "I'm not?" note that in his reflection, his mouth does not move.
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.
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.
The Secret Box / Band Geeks - S2-E14
Audio problem: At the end of "Band Geeks" when everyone is playing "Sweet Victory" at one point Mrs. Puff is shown playing the guitar. When this happens, you can see the others in the background not doing anything, even though their instruments are heard.
The Bully / Just One Bite - S2-E17
Audio problem: In "Just One Bite", Squidward is running, then tiptoeing by Spongebob's house. The sound of his running is fine, but the sound of tiptoeing is faster and not in sync with with movement.
Welcome to the Chum Bucket / Frankendoodle - S3-E2
Audio problem: The first time the man yells in "Frankendoodle", his mouth isn't in sync.
Nasty Patty / The Idiot Box - S3-E4
Audio problem: When SpongeBob and Patrick give Squidward the T.V, Squid's mouth doesn't move when he says "Oh boy, oh boy, oh boy!"
Answer: I believe this is the Season 6 episode "Spongicus".