Chum Bucket Supreme/Single Cell Anniversary - S6-E22
Other mistake: In Chum Bucket Supreme, when Plankton is changing his sign for his restaurant, the door to the Chum Bucket is missing. (00:01:10)
Chum Bucket Supreme/Single Cell Anniversary - S6-E22
Continuity mistake: In "Single Cell Anniversary", Spongebob places a megaphone on the ground. In a few shots, the megaphone has disappeared by itself.
Chum Bucket Supreme/Single Cell Anniversary - S6-E22
Continuity mistake: In "Chum Bucket Supreme", Patrick is painting the slogan "Krabby Patties Are Fum" on the Krusty Krab with no hole in the back of his head. In a few shots, Patrick is standing in the same spot, and the hole in his head has reappeared.
Chum Bucket Supreme/Single Cell Anniversary - S6-E22
Continuity mistake: In "Chum Bucket Supreme", Mr. Krabs hears the sound of Plankton's cash register, and the wide shot shows him standing on the pavement around the Krusty Krab. In the next shot, he is now standing in sand.
Chum Bucket Supreme/Single Cell Anniversary - S6-E22
Continuity mistake: In "Chum Bucket Supreme", Mr. Krabs notices that there are only two customers in the Krusty Krab. When he goes up to the front window, the customers and their tables have vanished.
Chum Bucket Supreme/Single Cell Anniversary - S6-E22
Continuity mistake: In "Chum Bucket Supreme", Plankton rips up a piece of paper on top of Karen. In a few shots, the ripped paper disappears.
Answer: I think that this was supposed to be an intended joke. Patrick is too stupid to remember or achieve most things and SpongeBob is able to remember and achieve most things, but the one thing that SpongeBob cannot achieve, is the one thing Patrick can achieve on the first go.
Casual Person