As Seen on TV / Can You Spare a Dime? - S3-E5
Revealing mistake: When SpongeBob is mopping the floor, two kids walk into the background and put mustard and ketchup on their patties. Nothing is coming out of the condiment tap.
No Weenies Allowed / Squilliam Returns - S3-E6
Continuity mistake: At the beginning of "Squilliam Returns," Squilliam is walking to Squidward from the left of the garbage pails. When Squidward throws his hat out, Squilliam is to the right of the garbage pails.
No Weenies Allowed / Squilliam Returns - S3-E6
Continuity mistake: In "No Weenies Allowed," when Spongebob gets punched by Patrick, he doesn't have a black eye. When the shot zooms to Spongebob's face, he has a black eye.
MuscleBob BuffPants / Squidward, the Unfriendly Ghost - S1-E11
Plot hole: In MuscleBob BuffPants, when SpongeBob first shows off his new inflatable muscles to everyone on the beach, he had the strength to punch two muscular fish into the air with them. A minute later, he could not even lift a glass of juice with the inflatable muscles. (00:04:25 - 00:05:20)
Other mistake: Always in the older episodes (and sometimes in the newer ones), when a fish in the background takes his/her second bite of a sandwich, the sandwich still looks like the first mark. It does this on every bite after the first.
The Snowball Effect / One Krabs Trash - S3-E3
Character mistake: In the beginning of "One Krabs Trash" Spongebob only has one bill in his hand, a 5 dollar bill. When he goes to his house and comes back, he says he found 68 cents. Therefore, he has 5 dollars and 68 cents. However, he has two dollar bills and a few pennies in his hand, which cannot be made into $5.68.
Big Pink Loser / Bubble Buddy - S2-E3
Continuity mistake: The broom that Patrick throws on the ground in Big Pink Loser disappears soon after.
Scaredy Pants / I Was a Teen-age Gary - S1-E13
Continuity mistake: When Spongebob is cutting his Jack-O-Lantern, he cuts out an eye on his right, but in the shot from inside the pumpkin the eye hole is gone, then the eye reappears.
Bummer Vacation/Wigstruck - S4-E14
Continuity mistake: In Bummer Vacation, on the overhead shot of Spongebob before he starts playing with his Krusty Krab play set, his eyelashes are missing.
Picture Day/Pat No Pay/Blackjack - S5-E13
Audio problem: Mr. Krabs' voice sounds a little muffled when he says, 'I got another job that even a nimrod like you couldn't mess up.'
Born Again Krabs (aka A Penny Saved) / Safety Freak (aka I Had An Accident) - S3-E17
Revealing mistake: I Had An Accident: Almost every time the actor in the gorilla suit is on screen, he is transparent, with the background showing through him. (00:20:48)
Patrick SmartPants/SquidBob TentaclePants - S4-E8
Continuity mistake: Patrick SmartPants: When SpongeBob first looks at his scrapbook, the title on the cover reads, "MY FRIEND PATRICK." In the next shot, it now reads, "MY FRIEND Patrick," with "Patrick" no longer being in all capital letters. The words also change from blue to purple between shots. (00:07:51)
Other mistake: At the Krusty Krab, SpongeBob tells Squidward to write a letter. Patrick then tells SpongeBob that he ripped his paper, and SpongeBob's shoes lose their colour mid-shot. (00:06:45)
Sandy, SpongeBob and the Worm / Squid on Strike - S2-E18
Continuity mistake: Squid on Strike: When Squidward opens his front door and sees Mr. Krabs, he says he thought he would drop by to beg him to come back to work. Mr. Krabs is standing in the doorway in this shot, but in the next shot, he is suddenly standing inside the house, away from the door. (00:09:43)
Sandy, SpongeBob and the Worm / Squid on Strike - S2-E18
Continuity mistake: Squid on Strike: The first time Squidward opens the door to his house, the door opens to the right. Later on, when he opens it again and sees Mr. Krabs, it now opens to the left. (00:09:03 - 00:09:40)
Born Again Krabs (aka A Penny Saved) / Safety Freak (aka I Had An Accident) - S3-E17
Continuity mistake: I Had An Accident: The Patrick suit that the gorilla is in has white eyes, but right before the gorilla bursts out of the suit, the eyes are pink instead of white as they should be. (00:20:48)
Born Again Krabs (aka A Penny Saved) / Safety Freak (aka I Had An Accident) - S3-E17
Revealing mistake: I Had An Accident: When the gorilla is beating up Patrick and Sandy in the bag, in some shots, there are faint lines on the screen due to the green screen being cropped incorrectly. In addition, when the gorilla smashes the chair onto the bag, some pieces of the chair cross one of the lines and disappear. (00:21:02)
Born Again Krabs (aka A Penny Saved) / Safety Freak (aka I Had An Accident) - S3-E17
Continuity mistake: I Had An Accident: When SpongeBob leaves his house to save Patrick and Sandy, he leaves the door open behind him, but in the next shot, the door is suddenly closed. (00:22:25)
Born Again Krabs (aka A Penny Saved) / Safety Freak (aka I Had An Accident) - S3-E17
Other mistake: Born Again Krabs: When the Flying Dutchman gives Mr. Krabs the choice of either taking SpongeBob or all the money in his pocket, the Flying Dutchman says he has 62 cents, and Mr. Krabs says he will take the money. In the next shot of SpongeBob, his right leg is missing. (00:10:35)
You Wish ('Shanghaied') / Gary Takes A Bath - S2-E11
Continuity mistake: Gary Takes a Bath: When SpongeBob is in the tree, Gary steals the ladder, then drops it behind him. The ladder can still be seen behind Gary two shots later, but it is gone in all the following shots. (00:22:13 - 00:22:58)
Chosen answer: You need to provide a little bit more information to be able to answer a question like this. In what region is it not being shown? I see it being replayed here in Australia fairly frequently. As for a general reason, there does not appear to be any for why it specifically might have been taken off the air in any country or region. Like any show certain episodes can sometimes not be replayed for long periods for unknown reasons.
Lummie ★