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
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)
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)
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)
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)
Grandma's Kisses / Squidville - S2-E9
Other mistake: Grandma's Kisses: After Grandma pulls the plug from the floor, she kisses SpongeBob and says that he can kiss his Grandma and still be an adult. In this shot, SpongeBob's legs are completely missing. His pant legs also vanish and reappear mid-shot, and even his legs appear for a frame or two, then vanish. (00:11:48)
Grandma's Kisses / Squidville - S2-E9
Continuity mistake: Grandma's Kisses: At the end, Grandma gives SpongeBob his sideburns and a cookie. He holds the cookie in his right hand, but in the next shot, the cookie has vanished from his hand. (00:12:00)
Grandma's Kisses / Squidville - S2-E9
Continuity mistake: Grandma's Kisses: When SpongeBob goes to have a "mature conversation with Patrick" in the kitchen, Patrick holds a glass of milk in his hand. SpongeBob then says, "We are supposed to be adults!" and in the next shot, the glass of milk suddenly appears on the table. (00:06:44)
Grandma's Kisses / Squidville - S2-E9
Other mistake: Grandma's Kisses: When SpongeBob goes to his Grandma's house with Patrick, Grandma tries to kiss SpongeBob, but SpongeBob's reflection in Grandma's glasses is not reversed; note the holes on his face. (00:05:14)
SB-129 / Karate Choppers - S1-E14
Other mistake: SB-129: When Squidward goes inside the freezer and shuts the door, the freezer's door handle vanishes mid-shot. (00:03:09)
SB-129 / Karate Choppers - S1-E14
Continuity mistake: SB-129: After Squidward accidentally breaks the lever to the time machine, he holds the lever with two hands, but he holds it with only one hand in the next close-up shot. (00:09:54)
Other mistake: When Squidward opens the door to his house on Christmas morning, the door incorrectly overlaps the snow decoration on his house. (00:13:49)
Continuity mistake: After Squidward finishes giving away all his stuff, in the close-up of him as he says, "Am I insane?", not only is the yellow door knob on the left side instead of the right like in the last shot, but it also turns into a gray door handle. A shot later, it's back to a yellow door knob on the right side. (00:20:05)
Continuity mistake: The door to Squidward's house opens inward throughout the episode, but when Squidward comes out of his house on Christmas morning, the door opens outward. (00:13:49)
Patrick SmartPants/SquidBob TentaclePants - S4-E8
Continuity mistake: SquidBob TentaclePants: When the mixed-up SpongeBob and Squidward come out of Sandy's matter transporter, Squidward's arm is on the left, and SpongeBob's arm is on the right. Later on at the Krusty Krab, in the shot after Mr. Krabs tells both of them, "Alright, that's it!", we can see that both arms are SpongeBob's, when the left one is supposed to be Squidward's. (00:17:42)
No Free Rides / I'm Your Biggest Fanatic - S2-E10
Character mistake: In the credits, actress Sirena Irwin's name is misspelled as "Sirena Irwn." (00:23:08)
Welcome to the Chum Bucket / Frankendoodle - S3-E2
Continuity mistake: Frankendoodle: When SpongeBob pranks Squidward by pulling the dollar away from him, Squidward's monocle falls on the ground, but when the mustache flies away, the monocle has vanished. A chain on the monocle also appears in one shot, then disappears. (00:15:47)
Mermaid Man and Barnacle Boy III / Squirrel Jokes - S2-E4
Other mistake: Squirrel Jokes: When SpongeBob looks in the mirror backstage after finishing his second act, the holes on his face are not reversed in the reflection (one of the holes also vanishes and reappears mid-shot). The second time his reflection is shown, they are reversed. (00:20:18)
Mermaid Man and Barnacle Boy III / Squirrel Jokes - S2-E4
Other mistake: Squirrel Jokes: At the end of SpongeBob's second act, as he tells the crowd, "Thank you, you've been a wonderful audience," he opens his eyes briefly, and they are coloured yellow instead of white as they should be. (00:20:14)
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 ★