Big Pink Loser / Bubble Buddy - S2-E3
Continuity mistake: Bubble Buddy: When Spongebob brings his Bubble Buddy to the Krusty Krab, Squidward's restaurant hat is visible on his head. It is not seen when he looks into Bubble Buddy when he says, "That Bubble Buddy sure looks good."
Big Pink Loser / Bubble Buddy - S2-E3
Continuity mistake: It seems to me that half the cards that Spongebob used for the card snail have disappeared when Patrick comes in.
Big Pink Loser / Bubble Buddy - S2-E3
Continuity mistake: When Patrick in Spongebob clothing is first revealed (when the rock is raised), Patrick has no collar, yet in other shots the shirt has a collar.
Big Pink Loser / Bubble Buddy - S2-E3
Continuity mistake: At the beginning of "Big Pink Loser", Patrick's rock is brown. When Spongebob and Patrick run with each other, out of the Krusty Krab, Spongebob runs into Patrick's rock, painted like Spongebob's pineapple house, yet when Patrick said "I'm going to defend my title" or something like that, the rock is brown. The rock can't possibly paint itself.
Big Pink Loser / Bubble Buddy - S2-E3
Continuity mistake: The broom that Patrick throws on the ground in Big Pink Loser disappears soon after.
Answer: I believe this is the Season 6 episode "Spongicus".