While SpongeBob is making Krabby Patties, he sings a song about how much he loves them, but stops in the middle and, while Squidward is stacking cups (in the form of a triangle), he inhales air, growing and size, and having his belt break. This annoying Miss Gristlepuss and causing Krabby Patties to be banned. Mr. Krabs causes the Krusty Krab to be closed by threatening Ms. Gristle Puss with a French fry strainer and calling her a disgusting old prune. Meanwhile, Plankton at first thinks Mr. Krabs changed the name to "The Closed Krab," but soon figured out he could take advantage of the moment and went out to celebrate. Mr. Krabs's archenemy soon discovered in surprise that the Krusty Krab has secretly been reopened at SpongeBob's Pineapple. He threatens Patrick who was asking Plankton for the "password" while finding that his threats make up the password. While Krabs was checking for cops, he goes to check on SpongeBob who was afraid of becoming arrested for making an illegal product. Mr. Krabs forces SpongeBob to work otherwise there would be weekends off. Plankton discovers Krabs is doing his regular business "under the table" and calls the cops. In the blink of an eye, they arrive to clean up the Krabby Patties and arrest the employees. Miss Gristle puss trips and a Krabby Patty dropped into her mouth which made her love the sandwich and forgave the Krusty Crew, she decides not to send Spongebob and Mr. Krabs to jail and unbanned Krabby Patties, she decides to reopen the krusty krab. Again, Plankton's plans failed and he hides inside one of the Krabby Patties only to be eaten by Ms. Gristlepuss.
When SpongeBob is under his table, Mr. Krabs says he'll make SpongeBob take weekends off if he doesn't continue cooking Krabby Patties, but in "SB-129," he is off on Sunday, which is the weekend. Mr. Krabs must have meant the entire weekends.
The episode alludes to the Prohibition Era, with the Krabby Patties representing alcohol and the secret Krusty Krab representing a Speakeasy.
Mrs. Gretel Puss's husband strongly resembles Duke Nukem.
Also, Miss Gretel Puss's husband say "Hello, This is Al G.", which sounds like algae.
This is the 100th episode in the series.
Miss Gretel Puss is voiced by SCTV alumna Andrea Martin.
The police can't make a food illegal, as the police only enforce the law. It is the government that makes the laws. And even then it would take some time to get it passed (if it is even passed). While here, it only took one day to pass.
If one were selling an illegal product in secret, it would be a dead-give away with a banner at the location in plan view.
Even though she calls herself Miss Gretel Puss, she should be called Mrs. Gretel Puss, because she's married.
SpongeBob had a watch when Krabs was standing outside the Krusty Krab, saying that Krabs was standing there for four days. It is possible he had a stopwatch or digital watch.
The Galley Grub wasn't seen in the Secret Krusty Krab. A probable explanation was that Mr. Krabs didn't have time to write another one after his original one was still locked in the Krusty Krab.
Harold was seen outside the pineapple when Plankton hears his "shoving" conversation, but he was found waiting in line inside the Secret Krusty Krab.
The Secret Krusty Krab most likely made a rule in which there is a limit of customers present within the building.
In reality, Miss Gristle-Puss has no power of shutting down the Krusty Krab and banning Krabby Patties only for the reason of it being "fun and delicious" even if her husbend is Chief of Police. They need to have a better reason like the food being poisonous to ban it. However, that most likely means that Miss Gristle-Puss has lied to the police to shut down the Krusty Krab, which can get her arrested for false accusations.
A banner in SpongeBob's house says "Keep it secret. Keep it safe." This is a reference to a line said by Gandalf the Grey in The Lord of the Rings: The Fellowship of the Ring.
When Squidward said "Do you want to 'Secret Size' that for $2 more" is a parody of McDonalds and their policy of allowing their customers to 'Super Size' their meal for more money.
When Mrs. Gretelpuss meets Mr. Krabs, his belt is missing. In the next shot, he was wearing his belt.
When SpongeBob is singing his song about Krabby Patties, the patties on the stove disappear.
After Mr. Krabs puts his eyes down, Ms. Gretel Puss says "Mr. Grabs" when with captions.
When Plankton asked Harold and Nat what was going on, he was wearing a suit. When he went up to SpongeBob's door and talked to Patrick, his suit was gone.
When police are breaking into SpongeBob's house, Plankton is briefly seen under a Krabby Patty bun. It's unknown why Plankton didn't steal the Krabby Patty like usual.
When Mr. Krabs went to the cash register to Squidward for misbehaving at Mrs. Gretel Puss and her crew, he was behind the boat and his body was overlapping the register.
When the Secret Krusty Krab was found by cops, SpongeBob and Mr. Krabs are handcuffed, but when Mrs. Gretel Puss accidentally falls down and eats a Krabby Patty, SpongeBob's handcuffs disappear.