It is closing time at the Krusty Krab, and Mr. Krabs tells SpongeBob that he is off to play cards against Plankton. SpongeBob is shocked that Mr. Krabs would risk losing anything to an unscrupulous guy like Plankton. Mr. Krabs confidently explains that Plankton is the worst card player in Bikini Bottom losing the game every Thursday night for fifteen years.
The next morning, Mr. Krabs, unaware that Plankton cheated in the card game, sadly informs SpongeBob that for the first time, he lost the game, and the wager of it has been not only SpongeBob's contract, but also, later on, Squidward's contract as well. Plankton arrives to spirit SpongeBob away to the Chum Bucket and immediately commands him to make a Krabby Patty, threatening to remove SpongeBob's brain and put it in a robot if he refuses to so. However, SpongeBob is unable to work in the Chum Bucket's cold, laboratory-like kitchen, and Karen suggests that with compassion and understanding, SpongeBob will come to obey.
Plankton goes to great lengths to improve SpongeBob's working conditions, eventually converting the Chum Bucket kitchen into an exact replica of the Krusty Krab kitchen. As time goes on, however, SpongeBob's humble requests turn into selfish demands, culminating into a refusal to listen to Plankton altogether.
After being fed up and forgetting to control his temper, Plankton takes out SpongeBob's brain and implants it in the robot. He, still belligerent, refuses to make a Krabby Patty. Plankton then begs Mr. Krabs to take SpongeBob back, saying that he cannot stand him and admitting that he cheated. Mr. Krabs welcomes back the restored SpongeBob and encourages him to get back to cooking. SpongeBob still does not feel like working, but when is given one glare from Mr. Krabs, SpongeBob quickly changes his tune.
There was a deleted scene where Plankton was taking out SpongeBob's brain before he puts SpongeBob's brain into the robot. 
The book Plankton reads to SpongeBob is also seen in "Grandma's Kisses." Even though the plots seem to be different. In this episode, it was about Sea Elves. In "Grandma's Kisses," it was about a Sea Leprechaun.
It is possible that this book contains multiple stories.
Mr. Krabs' singing voice in this episode is similar to Louis Armstrong.
Plankton breaks the fourth wall when he says to the audience "I put the brain in the robot, you know..."
This episode was the subject of a clue on the episode of Jeopardy! that aired on October 10, 2005, during Back to School Week.
Things Plankton did to try to get SpongeBob to make a Krabby Patty:
Krusty Krab kitchen replica
Pushing him on a rolling seahorse
Reading him a book
Not hitting him
Rubbing his feet
Plankton put SpongeBob's brain into Robot SpongeBob's positronic head. If Plankton took out SpongeBob's brain and then put it back in after (he put it back into SpongeBob's head when Robot SpongeBob would not take commands), SpongeBob would have died when the brain was taken out, because once a brain is taken out, it cannot be put back into a head without the person resulting in death.
However, SpongeBob is shown in later episodes to still be alive without his brain in his head, so it's most likely that he still was alive after Plankton took his brain out.
Robot SpongeBob's refusal of Plankton's order of making a Krabby Patty is possibly from the fact that the real SpongeBob's memories/thoughts are still kept in his brain, despite removal from its veins.
This is the second episode to have computerized picture-shaking effects. They occur whenever Plankton moves the grill. The first time to use these effects was "Neptune's Spatula."
The premise of Robot SpongeBob is similar to the plot of The Simpsons' Treehouse of Horror II segment named "If Only I Had a Brain," featuring Homer's nightmare. Homer, a lazy worker, is kidnapped by Mr. Burns and Smithers, who put his brain into a robot. The robot ends up being lazy and refusing to work, just like Homer.
The PlayStation version of SuperSponge shows clips of this episode in the "introducing Mr. Krabs and Plankton" scene. It is unknown how the clips could have gotten in the game because SuperSponge was released about two months before this episode aired.
The scene where SpongeBob and Krabs singing as they missed each other was rarely shown in Indonesia. This was done due to time constraints as its airings were paired with ads.
When SpongeBob was bathing, his sleeves were shown. This could be an error. This error also occurs in the previous episode "Gary Takes a Bath."
At the end of the episode, when it shows the Krusty Krab, a "Help Wanted" sign can be seen on the right window. This error happens again in "Krab Borg."
In this episode, it is possible that Mr. Krabs had just not taken the sign down from when SpongeBob was gone.
Throughout the entire scene where Plankton moves SpongeBob's grill, there is a light blue border. This error also occurs in "The Secret Box" and "Band Geeks."
In the opening credits, the k in Carson Kugler's name is lowercased instead of capitalized. This also happens again in "The Secret Box" and "Procrastination."
Sometimes, YTV shortens the title of this episode and lists it as "Chumbucket." This change gets rid of the first three words and combines "Chum Bucket" into one word instead of two words. Also for some reason, YTV sometimes says this episode originally aired on 2015/12/05 (December 5, 2015). This air date is technically incorrect.
When Mr. Krabs throws SpongeBob down near the opening when he is down his right arm (viewer's left), his arm flashes about eight to ten seconds until Squidward appears.