Nasty Patty / The Idiot Box - S3-E4
Continuity mistake: Nasty Patty: After the police officer cancels his Krabby Patty order, when he tells his partner they got a call about "two ghouls burying a stiff," Krabs' office door is missing.
Nasty Patty / The Idiot Box - S3-E4
Continuity mistake: Nasty Patty: When Krabs pushes SpongeBob out of the kitchen telling him to pour on the charm for the health inspector, the door swings opens at the left side, but when SpongeBob goes back to the kitchen to order one of everything, that door opens the opposite way, then the switch happens again.
Nasty Patty / The Idiot Box - S3-E4
Continuity mistake: When SpongeBob is showing Squidward the inside of the box, SpongeBob is seen closing the top of the box. But inside of the box, there is a close-up of SpongeBob and Patrick. You can see daylight so the box is obviously open.
As Seen on TV / Can You Spare a Dime? - S3-E5
Continuity mistake: In "As Seen On T.V", the hat on Mr. Krabs's desk has 2 lines on the anchor instead of 1.
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.
As Seen on TV / Can You Spare a Dime? - S3-E5
Continuity mistake: As Seen on TV: After SpongeBob shouts about the grand finale he tosses all the food at the hungry crowd, and as they all happily exclaim, "Krabby Patties," there is only one door to the right of Squidward's order station in this shot, though there should be two doors.
As Seen on TV / Can You Spare a Dime? - S3-E5
Continuity mistake: As Seen on TV: The front door to Mr. Krabs' office is a solid door with an anchor on the exterior side of the door, but in a few shots the office's front door has a porthole window like other doors in the restaurant.
As Seen on TV / Can You Spare a Dime? - S3-E5
Continuity mistake: When SpongeBob is making the patties at the end, he puts at least 20 patties on the grill. But just after he takes the buns out of the bag, there are now only 10 patties.

No Weenies Allowed / Squilliam Returns - S3-E6
Other mistake: Squilliam Returns: After Squilliam tells Squidward that he is a cashier just like him, Mr. Krabs is shown playing his small violin, but his eyes are coloured white instead of their usual pale green colour. (00:23:07)
No Weenies Allowed / Squilliam Returns - S3-E6
Continuity mistake: In "No Weenies Allowed", the gatekeeper in front of the sailor club has a tattoo on his front with a heart and MOM on it. Sandy rips it out and places it back upside down. It now shows an upside down heart with WOW. In the next cuts between this and when Spongebob gets sent to the Weenie place, the tattoo suddenly has the heart downside up reading WOW, or upside down reading MOM. This is never possible because MOM was supposed to be with the downside up heart, not the upside down heart.
No Weenies Allowed / Squilliam Returns - S3-E6
Continuity mistake: When Squidward has sort of a strict conversation with Spongebob, Mr. Krabs, and later Patrick, the 3 of them he was talking to, were side by side, but a shot later, Mr. Krabs and Spongebob are side by side, but farther from Patrick.
No Weenies Allowed / Squilliam Returns - S3-E6
Continuity mistake: In "Squilliam Returns", when Squilliam arrives at the "5-star restaurant" it is nighttime, but at the end when Squidward says "Will you get out of here!" to Mr.Krabs and it zooms out on the Krusty Krab it is daytime.
No Weenies Allowed / Squilliam Returns - S3-E6
Continuity mistake: In "No Weeneis Allowed", Patrick punches SpongeBob's left eye, but the black eye is on SpongeBob's right eye.
No Weenies Allowed / Squilliam Returns - S3-E6
Continuity mistake: In "Squilliam Returns", the world's smallest violin changes position between shots.
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.
The Algae's Always Greener / Sponge Guard On Duty - S3-E7
Continuity mistake: The Algae's Always Greener: After Plankton uses his machine and wakes up in the Krusty Krab office, he looks out through the porthole on the office door leading to the eating area, but the porthole on that office door vanishes when Plankton returns to the office with the two Krabby Patties. (00:04:25)
The Algae's Always Greener / Sponge Guard On Duty - S3-E7
Continuity mistake: In "The Algae's Always Greener", after Squidward barges into Mr. Plankton's office, you can see that there are no krabby patties on Mr. Plankton's desk, but when it pans back to Mr. Plankton's desk, there are two krabby patties on his desk. (00:07:35)
The Algae's Always Greener / Sponge Guard On Duty - S3-E7
Continuity mistake: When Plankton says, "Look at his daughter. She's as big as a whale!", the soda can on the table suddenly moves to the left.
The Algae's Always Greener / Sponge Guard On Duty - S3-E7
Continuity mistake: The Algae's Always Greener: At the start, the old man is carrying a tray with just a Krabby Patty and fries, but after the old man gets the ketchup bottle Plankton zooms in on the tray, and in this closeup there's a fork and a drink with a straw beside the Krabby Patty, then they vanish.
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 ★