Plot hole: As Spongebob is trying to let the Jellyfish out of their enclosure after discovering what Mr Krabs is doing to them, Krabs says, "That door will only open if I say...open." Then he suddenly realises what he's said and the door opens. How come the door didn't open when in his sentence he first said open? The door didn't activate itself until he said open the second time.
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.
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.
Continuity mistake: In the episode "Survival of the Idiots," when Sandy wakes up in Spring and goes outside, the first time we see Patrick and SpongBob standing side by side, SpongeBob is to our left, but later when SpongBob is trying to make up an excuse, they've swapped places.
Continuity mistake: In "Squid's Day Off" when Mr. Krabs is washing the money that came out of the register, Spongebob taps him on the shoulder while the faucet is still on. When Mr. Krabs drops the dime into the sink, the water turns off without anyone touching the handles.Mr. Freeze
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.