Best Day Ever/The Gift of Gum - S4-E20
Revealing mistake: When Squidward says "I suppose if you haven't fixed my clarinet, the concert would have been a bust", Sandy's tail is the same color as her suit.
Atlantis SquarePantis - S5-E12
Revealing mistake: Atlantis SquarePantis: After the Atlantis van crashes through the museum's ceiling, Squidward is surprised that it's the magical path to Atlantis, and while Krabs says, "Nice hot rod flames," note how only the disembodied tip of Patrick's arm clips in front of SpongeBob's body (it even moves as Patrick moves), due to an animation error in this shot. (00:09:55)
Revealing mistake: In "Not Normal" when SpongeBob says "Hmm. This video tape should help," his left arm is missing. (00:01:25)
Revealing mistake: When Spongebob and Mr. Krabs are rolling in the pile of money, dollar bills are flying into the air. After crossing an invisible line, the dollar bills disappear in mid-air. (00:11:35)
