Nat Peterson (Non-speaking cameo at the beginning , exiting The Krusty Krab)
Debbie (Non-speaking cameo at the beginning, exiting The Krusty Krab)
Near closing time at The Krusty Krab, SpongeBob finishes washing the dishes. However, he finds one spot that takes a long time to get it off the plate. Mr. Krabs then states that he can't leave until he gets the spot removed. SpongeBob attempts various methods (such as a gun, a laser, and a bomb) to the point of virtually destroying the Krusty Krab. In the end, SpongeBob succeeds at his goal, but destroys the Krusty Krab in the process from a nuclear explosion.
I can turn into a skyscraper!
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The Spotmaster 6000's power source is not revealed in this episode, but since an incredibly huge amount of energy is used and only an atomic bomb can create a blast that huge, the machine could be nuclear-powered.
Mr. Krabs refers to a blowtorch as "welding equipment."
A blowtorch is not hot enough to weld.
The Spotmaster 6000 may be a reference to the Ghostbusters Series, in the movie they use nuclear accelerators & "cross the streams" as the Spotmaster does.
In real life, mixing microwave radiation & water will just cause a lot of steam.
In 1 airing, the split-screen closing credits for this and 2 sister episodes were shown with the beginning of episode, the audio plays over the United Plankton Pictures, Inc. and Nickelodeon logos. The letter freezes through most of the episode.
In Polish, the title called Czysty talerz (The Clean Plate.)
When SpongeBob says,"It may end life as we know it, but I am crossing the beams!" it is a reference to the movie Ghostbusters in which it is revealed that crossing the beam of their proton-pack lasers will end life as they know it.
When SpongeBob is talking to the plate before he fires the laser, his speech and accent are a reference to the James Bond movie "Dr. No".
When Mr. Krabs says "Oh, this time, ya done it, boy.", part of the floor is missing, but when he's chasing SpongeBob around in circles, the floor is a piece.
When Mr. Krabs starts chasing SpongeBob, it seems like the foundation of the Krusty Krab is quite small considering the small amount of the space that Mr. Krabs is chasing SpongeBob on.
When the Spotmaster 6000 starts to turn to ashes, SpongeBob has his helmet on. However when SpongeBob falls on the ground, the helmet has disappeared.
The plate's spot is below before SpongeBob shot the pink sponge. Later, it was above.