SpongeBob wakes up on a normal day, as usual. He looks out his window and sees the mailman riding by on his bike. He says "Hi" to the mailman. This causes the mailman to get distracted and a truck crashes into him. After that, SpongeBob wants to spend time with his friends; however, he ends up upsetting them. He accidentally breaks Gary's shell, crushes Patrick's cake, disturbs Squidward's beauty sleep, destroys Sandy's robot, and deep fries Mr. Krabs' money. SpongeBob decides to leave Bikini Bottom, as all his friends started to hate him (and cruelly calling him "idiot boy"). As he leaves, he is attacked by cannibals who attempt to kill & devour him. While he runs from the cannibals, he falls off a cliff and bumps his head, he gets a lump but his bundle hits him on his head knocking him unconscious. Back in Bikini Bottom, Patrick and Sandy (who had supposedly come over to apologize to SpongeBob for the other day) find Gary who is extremely huge and overweight and a note from SpongeBob, explaining that he has left forever. Everybody is upset and guilty that SpongeBob is gone, with the obvious exception of Squidward, who is delighted.
Meanwhile, SpongeBob wakes up with amnesia. A couple of fish give him a new name, "CheeseHead BrownPants", so that they can steal his possessions and take advantage of his amnesia. All SpongeBob has left is a bottle of bubble soap. He wanders around until he ends up in New Kelp City where he attempts to get a job. Each time he gets a job he uses his bubble blowing ability to help him, but this strikes fear into all the residents of the city. This activity attracts the attention of the Bubble Poppin' Boys and their leader, Trevor who have scared the city into never blowing bubbles. SpongeBob uses his ability to get rid of the gang and is rewarded by getting the position of mayor of New Kelp City.
Back in Bikini Bottom, Mr. Krabs is hoping for the return of SpongeBob so he can prepare Krabby Patties, while Patrick and Sandy want their friend back. Squidward does not seem to care until Mr. Krabs offers him a reward of a Fabergé egg. He then reluctantly chooses his love of art over his hatred of SpongeBob and the trio see a newspaper stand showing news of SpongeBob's position as mayor, but when they go to New Kelp City to retrieve him behind Squidward's back, he cannot remember them. They then manage to kidnap SpongeBob and return him to the Krusty Krab, but he wants to return to New Kelp City. Squidward, who does not care if SpongeBob stays or not slips on a greasy spatula and accidentally throws his egg onto SpongeBob's head. The impact gives SpongeBob his memory back, and Mr. Krabs, Sandy, and Patrick apologize for running him out of town. But even so, SpongeBob still wants to return to his position as mayor, because he feels bubble blowing needs to be commonplace in; New Kelp City society. At that moment a news report comes on the television saying that the bubbles in New Kelp City are causing mayhem, and he is being threatened by a thug. Upon hearing this, SpongeBob has second thoughts about going back to New Kelp City, and decides to stay in Bikini Bottom. And then Squidward's head opens and he throws his brain in the garbage when SpongeBob change back forever.
Patrick and SpongeBob - "I'm gonna go back and make a 2nd b-day cake my mother will like!"
SpongeBob looking at Sandy's broken robot
"Get out of here!"
Mr. Krabs falling down
"I better not hit my head again. That might cause a concussion."
"What could possibly be wrong with practicing the bubble arts?"
This episode was advertised as " WhoBob WhatPants?".
This is the first episode with a full character displayed on the title card.
The title card has two quotations on the title. The episode itself does not have those quotations.
Sandy appeared to be either MIG or TIG welding. However, she had no protective clothes on except for her head shield (especially dangerous as she is covered in fur), and her gloves appeared to be rubber instead of rawhide.
Mr. Krabs' nose swells up and explodes with a jet of water. Real-life crabs can do this, but instead squirt water from their eyes.
In "Texas", Sandy uses a handle to flush her tears out of her helmet. However in this episode she is not seen using it.
Here are the things what SpongeBob done to get called Idiot Boy:
He accidentally destroyed Patrick's mother's birthday cake.
Disturbed Squidward's beauty sleep.
Tripped over and splashed water on Sandy's robot.
Accidentally knocks Mr. Krabs' dollars in the fryer.
In "New Digs", SpongeBob was one minute late and Mr. Krabs was okay with this. In this episode, he is not okay with SpongeBob being 10 seconds late. He however, did say "don't do it again!"
It maybe that Patrick`s mothers birthday is during the day or later, and ever since when did Patrick made a cake as of last time that SpongeBob got him a cake for a particular Birthday.
Bikini Bottom's population is revealed to have been 538 (SpongeBob crosses out the eight before leaving, so the population was 537 for the duration of the episode).
Ray Liotta have been three times of been a voice actor: as Tommy Vercetti protagonists of video game Grand Theft Auto: Vice City, as Leader Poppin Boy in this episode and as himself in the 2007 animated film Bee Movie.
This is the first time SpongeBob appeared on a title card. SpongeBob will also appear on the title card as a drawing in Oral Report and in a close-up view in InSPONGEiac.
According to Patrick when Sandy was asking him where was SpongeBob, he said that he has been knocking on SpongeBob's door for 3 hours.
While walking in New Kelp City, SpongeBob asks a random fish, "Is there something wrong with me?". After that, a hideous face of SpongeBob is shown, which has become an internet meme around YouTube. The fish is also the one who ordered the monster Krabby Patty from the episode All That Glitters.
Nat is shown in Bikini Bottom and in New Kelp City.
Mr. Krabs reads SpongeBob's note without an eyesight problem, but in "Greasy Buffoons", he reads with glasses.
Most of the citizens of NKC are citizens of Bikini Bottom.
Squidward's hatred for SpongeBob is clearly demonstrated in this episode, as he attempts to sabotage the search efforts, to the point where Mr. Krabs has to bribe him.
The people who wrote this episode were the same people who wrote Atlantis SquarePantis.
Mr. and Mrs. Dollar could possibly be a spoof of Jack and Rose from the movie Titanic.
There was a hole in the top of SpongeBob's water helmet, however when he went back out into the water outside the treedome, you could still see the top of the water in his helmet despite the fact there was a hole in the top of the helmet.
When Squidward says "You mean this can actually find SpongeBob" his voice is out of sync with the animation.
When SpongeBob puts his pants on, his shoes are automatically on.
When "Mr. Dollar and Mrs. Dollar" are in the grease, instead of sinking in and never coming back out, they crust and singe.
When the builder hides behind a pile of metal, a lot less of him shows than how tall he is, and the fish don't have knees.
When the line of people are afraid of the bubble, it would have either floated upward or popped before it got to the front of the line.
In a scene where Sandy pounced the door, Patrick landed on his milkshake, but his milkshake was intact, which is physically impossible, unless it went up his mouth.
When Squidward is shown driving SpongeBob's limo the front flag is missing.