Continuity mistake: In "Squeaky Boots", Mr. Krabs starts hearing squeaky sounds everywhere. Then he goes mad, and says he took the boots from SpongeBob. In this point, notice of the restaurant floor's color. Mr.Krabs somehow lifts the whole restaurant but we can still see some floor (where Krab is). Notice that now the color of the floor has changed.
Continuity mistake: At the beginning of "Born Again Krabs", it shows the outside sky being orange-ish. But when it shows SpongeBob and Mr. Krabs talking about the old patty, you can see a little blue crack through the window.
Continuity mistake: In "Sing a Song of Patrick", Patrick creates his own song and listens to it with Spongebob in his pineapple. And at the end of the song the pineapple melts and the stereo falls on top of them and not the pineapple. But when they get up, the busted stereo disappears and the pineapple is on top of them.
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Continuity mistake: When Spongebob is crying next to the employee of the month wall, (just before he says "How could I have let the quality of my work slip so much?") the order of the pictures is messed up. It goes December, February, January. Then, when we see the close-up of Squidward's face laughing, the order is correct again.
Continuity mistake: In "Dumped", when Gary takes Patrick's cookie they are in the laundry room. When SpongeBob wants to take Gary for a walk, they instantly appear in the living room. SpongeBob also has a leash in his hand. There is no time for them to walk from the laundry room to the living room.