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Sleepy Time / Suds - S1-E15

Revealing mistake: After SpongeBob disguises himself as Patrick's rock and right before he sneezes his uvula clips through his bottom lip.

Girl Trouble / School Dance - S3-E18

Continuity mistake: Besides the fact that when Helga is sharpening her pencil, the desk arrangement changes, one of the students visible when she looks at Arnold is... Helga. This happens because the shot is taken from the episode "Helga's Love Potion."

Weird Cousin / Baby Oskar - S4-E11

Other mistake: Stephen Viksten is credited twice for voicing Oskar.

AidanN