Club SpongeBob / My Pretty Seahorse - S3-E12
Revealing mistake: In Club SpongeBob, when SpongeBob, Patrick and Squidward are in the forest, Squidward asks the magic conch shell if he can have something to eat. Straight after he asks "Can't you say anything else but 'No'?", it has a close-up of the shell. But Squidward's arm appears to be yellow, like SpongeBob's. This error was later corrected in 2019 when the episode was remastered for digital releases.
Chocolate With Nuts / Mermaid Man And Barnacle Boy V - S3-E11
Revealing mistake: In one scene with Spongebob, Patrick, an old lady, and her almost dead mom, in one part Spongebob has no holes on his face. There is also a light-colored spot near Patrick's mouth.
Krab Borg / Rock-a-Bye Bivalve - S3-E8
Revealing mistake: In the shot that shows the outside of the Krusty Krab (in Krab Borg) they reused the drawing of right before the customers ran out of the building because you can see many customers crowded at the door. This shot lasts about 2 seconds but it's not hard to spot. (00:08:05)
SpongeBob Meets the Strangler / Pranks a Lot - S3-E20
Revealing mistake: In "Spongebob Meets The Strangler" when that fish holds up Spongebob's dry cleaning at the supermarket, it looks like he is holding it up with a coathanger because his hand is up in the air, but you can easily see nothing is holding it up. It's just floating up in the air.
Suggested correction: The clothes are being held up by a coat hanger. It may be hard to see due to it blending in with the wall color, but if you look closely, it's there.
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.
