Ghost Host/Chimps Ahoy - S4-E10
Continuity mistake: In "Chimps Ahoy", Spongebob removes a helmet he was wearing and holds it in his hands out of frame. In the next shot, the helmet is missing and not on the ground.
Continuity mistake: In "Once Bitten", Mr. Krabs is holding a key, about to unlock the doors to the Krusty Krab, when a customer stops him. Two shots later, the key is missing from his hands.
Continuity mistake: In "Once Bitten", there is a keyhole on one of the doors to the Krusty Krab. Several shots later, the keyhole disappears.
Continuity mistake: In "New Leaf", When Mr. Krabs throws Plankton's snow globe in to the room, there is no lock. In the next shot, there is.
Bummer Vacation/Wigstruck - S4-E14
Continuity mistake: In Wig Struck, Patrick takes a bite out of Spongebob's wig and in the next shot, the wig is restored.
Squidtastic Voyage/That's No Lady - S4-E15
Continuity mistake: In "That's No Lady", Patrick goes up to the man with a briefcase holding a pad of paper and a pencil. In two shots, the pad and pencil Patrick was holding disappears.
Squidtastic Voyage/That's No Lady - S4-E15
Continuity mistake: In "That's No Lady", there is a place card on the table Mr. Krabs is sitting at. When he puts a sheet over the table, the spot where the card was, doesn't bulge.
Squidtastic Voyage/That's No Lady - S4-E15
Continuity mistake: In "That's No Lady", Patrick has some type of glasses, which he takes off his face and holds in his hand. In the next shot, they disappear.
Squidtastic Voyage/That's No Lady - S4-E15
Continuity mistake: In "That's No Lady", Patrick runs through Spongebob's wall, leaving a Patrick-shape in his house. Patrick pushes a bit of Spongebob's house, which disappears in the next shot.
Squidtastic Voyage/That's No Lady - S4-E15
Continuity mistake: In "That's No Lady", Spongebob has a tray with two lemonades and gives one to Patrick. In two shots, the tray and the two glasses of lemonade disappear.
Squidtastic Voyage/That's No Lady - S4-E15
Continuity mistake: In "Squidtastic Voyage", Squidward drinks many bottles of soda to try and get Spongebob and Patrick out of his stomach. Two shots later, these bottles all disappear without anyone touching them.
Squidtastic Voyage/That's No Lady - S4-E15
Continuity mistake: In 'Squidtastic Voyage", Spongebob uses a remote to open the doors of the submarine. This remote disappears in the next shot.
Squidtastic Voyage/That's No Lady - S4-E15
Continuity mistake: In "That's No Lady", Squidward is standing at the register, holding a newspaper. When it cuts to "Patricia", and back to Squidward, Squidward isn't holding the newspaper anymore.
The Thing/Hocus Pocus - S4-E16
Continuity mistake: The Thing: When Squidward is riding his bike on the road, he hits a cement truck, and gets covered in cement. He tries to get out of it, and a shot later, the location suddenly changes from the road to a green hill. (00:04:05)
The Thing/Hocus Pocus - S4-E16
Continuity mistake: At the start of "The Thing" the walkway to Patrick's house is missing.
The Thing/Hocus Pocus - S4-E16
Continuity mistake: In 'The Thing' the house of Squidward's door first opened outwards, then later inwards. It also changes color.
Driven to Tears/Rule of Dumb - S4-E17
Continuity mistake: In 'Rule of Dumb' Patrick's house returned to its former self in the outside shot just before Squidward's house was moved.
Born to Be Wild/Best Frenemies - S4-E18
Continuity mistake: When we first see Plankton, the distance between him and the Kelpshake store keeps changing between shots. (00:02:20)
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.
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 ★