Darkness-Induced Audience Apathy: None of the characters are even remotely likable from Squidward being a massive Jerkass to SpongeBob by reading his diary and bragging it towards everyone, the citizens of Bikini bottom giving Squidward a Disproportionate Retribution for reading it and being massive hypocrites throughout the episode and SpongeBob being an idiot for leaving his own diary unguarded. The only possible exception is Mr. Krabs, who was not involved in reading SpongeBob's diary like the hypocritical citizens and did call Squidward out on what he did while still not taking part in the town's disproportionate retribution on him.
Mrs. Puff is much better in this episode than she was back in "Demolition Doofus."
Another thing this episode tries to do is deconstruct SpongeBob's flanderization when it comes to his bad driving, which had been getting worse since Season 2. In it, SpongeBob is back to just being incredibly nervous behind the wheel, which just so happens to cause him to do tons of property damage. When the show revived in 2015, the flanderization took over once again.
Tear Jerker: SpongeBob breaking down to tears after Mrs. Puff harshly tells him that he's failed his boating test once again and tells him to get out of her sight.