Karen 2.0/InSPONGEiac - S8-E28
Continuity mistake: Karen dumps a load of chum on a tray and some of the chum lands on the table. The chum that fell on the table magically disappears from shot a split second later.
Hello, Bikini Bottom/Extreme Spots - S8-E29
Continuity mistake: In "Hello, Bikini Bottom", when we see Mr. Krabs' list of what he needs for the tour, the word "roadie" is on the bottom of the list, but when we see the list again later on, "roadie" is in the middle of the list.
Patrick-Man!/Gary's New Toy - S9-E2
Continuity mistake: In "Patrick-Man", in the scene after Mrs. Puff gets arrested, the guy that SpongeBob serves the krabby patty to in the Krusty Krab is not wearing a T-shirt until the guy says "Lets hope Patrick Man doesn't confiscate this one," then he is seen wearing a white T-shirt. (00:08:00)
Little Yellow Book/Bumper to Bumper - S9-E4
Continuity mistake: In "Bumper to Bumper", Mrs. Puff gets out of the boat and asks Spongebob to switch seats with her, and Spongebob is wearing his seat belt. In the next shot, once she has made her way around the boat to the side where Spongebob is sitting, he is no longer wearing his seat belt.
The Fish Bowl/Married to Money - S9-E18
Continuity mistake: In "The Fish Bowl", Sandy has a wristwatch on her right wrist when she first appears on the bus. When she sits near the front to observe the fish, the wristwatch has disappeared and doesn't reappear.
The Fish Bowl/Married to Money - S9-E18
Continuity mistake: In "Married to Money", Pearl cries and her tears flood Mr. Krabs' house. When this happens, he pulls a in the floor to let the water drain. In a few shots, this plug and drain are missing.
Sold!/Lame and Fortune - S9-E21
Continuity mistake: In 'Lame and Fortune', a big box of fortune cookies drops in SpongeBob's backyard. When Gary goes to read his fortune, he leaves a slime trail. However, the slime trail disappears and reappears between shots.
Patrick's Coupon/Out of the Picture - S10-E10
Continuity mistake: In "Patrick's Coupon", after Patrick is released from the crane, he suspects two male fish of wanting to steal his coupons. Next, he hears two female fish talking and thinks they want his coupon too. When he goes to talk to them, the guys he was just talking to have disappeared. In two shots, the male fish reappear.
Patrick's Coupon/Out of the Picture - S10-E10
Continuity mistake: In "Out of the Picture", when Squidward and Spongebob are running back to the Krusty Krab while being chased by Mr. Krabs, a shot of them entering the establishment shows an empty restaurant, but in two shots, once they've entered the restaurant, the paintings and the art expert are now inside it.
Patrick's Coupon/Out of the Picture - S10-E10
Continuity mistake: In "Patrick's Coupon", when Patrick is kicked out of the ice cream store, he is covered with ice cream. In a close up shot, he has a huge amount of ice cream on him as well as as a cherry. When it cuts to the next shot, this pile of ice cream and cherry have disappeared.
FarmerBob/Gary and Spot - S12-E1
Continuity mistake: In "FarmerBob" when SpongeBob is taken to Old Man Jenkins' farm, after that, the next shot when he is stretched about 50m tall by a bag of potatoes, the tie is missing. (00:00:50 - 00:01:25)
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 ★