Plot hole: In "Once Bitten", Mr. Krabs never unlocks the doors to the Krusty Krab, but at the end of the episode, Squidward enters with no problem.

SpongeBob SquarePants (1999)
1 plot hole in New Leaf/Once Bitten - chronological order
Starring: Clancy Brown, Tom Kenny, Bill Fagerbakke, Rodger Bumpass
The Secret Box / Band Geeks - S2-E14
Audio problem: At the end of "Band Geeks" when everyone is playing "Sweet Victory" at one point Mrs. Puff is shown playing the guitar. When this happens, you can see the others in the background not doing anything, even though their instruments are heard.
Dying For Pie / Imitation Krabs - S2-E6
Mr. Krabs: What's the most important rule here?
Spongebob: No free napkins?
Mr. Krabs: No, the other most important rule!
Spongebob: Only discuss the secret formula with Mr Krabs.
Mr. Krabs: As long as you do that, the formula is safe.
Squidward: I thought the most important rule was why do today what you can put off for tomorrow?
Mr. Krabs: But what's today, but yesterday's tomorrow?
Squidward: What?
Question: What is the episode when Spongebob is stepping on toy ducks?
Answer: "The Secret Box", or maybe "Karate Choppers".
Yeah, definitely "Karate Choppers."
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Suggested correction: Maybe Squidward has a key to the Krusty Krab that Mr. Krabs doesn't know about.
ccoccia
Absolutely not. There is a very clear shot of Squidward pushing the doors open without a key.
zenee
He could still have a key, but we don't see it.
Whether or not Squidward owns a key to the Krusty Krab is beyond the point of the mistake here. The point is that Squidward is able to walk into the Krusty Krab despite the doors being locked, and he doesn't use a key or anything else to unlock them. He just pushes them open.
zenee
Maybe the doors were not locked properly.