Krabby Land / The Camping Episode - S3-E19
Continuity mistake: In "Krabby Land", Spongebob goes to check his motivational quote and from far away, the page is flipped up. But in the next shot, it is a close up and the page is flat against the stack. In the following shot, the page is flipped up again.
Pizza Delivery / Home Sweet Pineapple - S1-E5
Continuity mistake: In "Home Sweet Pineapple", Spongebob goes into Squidward's house to spend the night and sits in his bed with the pillow just the right size for him. But in the next shot, when Squidward climbs into bed next to him, the pillow has drastically grown and now both of them can lay on it perfectly.
Pizza Delivery / Home Sweet Pineapple - S1-E5
Continuity mistake: In "Pizza Delivery", Spongebob points out the antennae for the boat during his vehicle inspection, but in a few shots, when he's checking the tire pressure, the antennae has vanished.
Born Again Krabs (aka A Penny Saved) / Safety Freak (aka I Had An Accident) - S3-E17
Continuity mistake: In "I Had An Accident", Sandy opens the door to show that she was being "attacked" by a gorilla and Spongebob is looking through that door to see the events unfold. But after a couple of shots, the door has closed by itself and Spongebob has to open it again before going outside.
SB-129 / Karate Choppers - S1-E14
Continuity mistake: In "SB-129", every time Squidward goes to answer the door to find Spongebob and Patrick there, the picture on the wall next to the door changes noticeably.
Born Again Krabs (aka A Penny Saved) / Safety Freak (aka I Had An Accident) - S3-E17
Continuity mistake: In "Born Again Krabs", when Mr. Krabs first makes his appearance next to Davy Jones' locker, there is some coral taking up a part of the bottom left corner. In a few shots, that same set of coral has disappeared.
Born Again Krabs (aka A Penny Saved) / Safety Freak (aka I Had An Accident) - S3-E17
Continuity mistake: In "Born Again Krabs", after Mr. Krabs returns from the hospital and the Krusty Krab has their "Grand Re-Opening", there are two big yellow signs on the front windows, but in the next shot from the inside, these signs have vanished.
Procrastination / I'm With Stupid - S2-E19
Continuity mistake: In 'Procrastination' when SpongeBob takes the stack of paper out of the drawer, the paper is the only thing in the drawer. In the next shot, SpongeBob pulls a pencil out of the drawer.
The Graveyard Shift / Krusty Love - S3-E13
Continuity mistake: In 'The Graveyard Shift' Squidward explains that there are three signs concerning the arrival of the Hash-Slinging Slasher. He then holds up three hands. In the next shot, he is only holding up one hand.
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.
Born Again Krabs (aka A Penny Saved) / Safety Freak (aka I Had An Accident) - S3-E17
Continuity mistake: In "Born Again Krabs", the doctor taking care of Mr. Krabs drops his clipboard and runs. When the Flying Dutchman appears in the next shot, the clipboard is missing.
Born Again Krabs (aka A Penny Saved) / Safety Freak (aka I Had An Accident) - S3-E17
Continuity mistake: In "Born Again Krabs", Mr. Krabs drops the coins that the Flying Dutchman gave to him on the floor. In a few shots, when the Flying Dutchman comes back, the coins have vanished.
Grandma's Kisses / Squidville - S2-E9
Other mistake: At the end of Grandma's Kisses, Harold "Bill" is olive green.
Chum Bucket Supreme/Single Cell Anniversary - S6-E22
Other mistake: In Chum Bucket Supreme, when Plankton is changing his sign for his restaurant, the door to the Chum Bucket is missing. (00:01:10)
A Pal for Gary/Keep Bikini Bottom Beautiful - S7-E14
Continuity mistake: In "A Pal For Gary", Spongebob opens the door to his library, causing it to fall off its hinges and drop about 5 feet, out of frame. In the same shot, the camera zooms out to reveal that the door is missing.
New Digs / Krabs à la Mode - S5-E6
Continuity mistake: In "Krabs à la Mode", Spongebob is wearing miniature mittens on his eyelashes while walking to the Krusty Krab. They disappear after a few shots.
Squidward's School for Grown Ups - S8-E18
Continuity mistake: Spongebob uses a razor to try and shave off Patrick's beard, which falls onto the ground. In two shots, the razor disappears.
Best Day Ever/The Gift of Gum - S4-E20
Continuity mistake: When SpongeBob tries to steal the gum at night, he's dressed as a bandit, but then the next day when Sandy finds him, he's wearing his normal clothing. He was stuck in the gum all night so there's no way he would have changed.
Continuity mistake: In "The Krusty Drive-through", Mr. Krabs creates a drive-through. However, an updated one can be seen in older episodes.
Karen 2.0/InSPONGEiac - S8-E28
Continuity mistake: In "InSPONGEiac", Spongebob drinks from a glass and drops it on the floor. In two shots, the glass has disappeared.
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 ★