Accidental Aesop: Whenever you're trying to make a promise to someone to keep a secret, do not even give out a slightest hint to someone else about it, especially when they cannot be trusted, persistent, and/or just simply won't keep their mouth shut, like the way Arnold answered to Sid and Stinky why he was giggling, namely "It's just something Iggy was wearing. That's all.", which made Sid and Stinky take wild guesses about it. Even though it's not a bad thing to be generally honest, sometimes it's just better to white lie to others about a private matter (whether it's yours or another person's), otherwise you can and will potentially, though unwittingly, ruin their life.
Catharsis Factor: After spending the entire episode putting Arnold through the wringer it's so satisfying to see Iggy get his comeuppance via the former rejecting his apology and ending his friendship with him.
Never Live It Down: Iggy forcing Arnold to wear bunny pajamas in public. Even though he realized his mistake after hearing Sid and Stinky admit to pulling the secret out of Arnold's mouth, Arnold never forgave him, nor did the fans. Even Craig Bartlett himself was ashamed of the episode, and Iggy never made another major appearance again. Sid and Stinky can qualify too, since they were the ones who randomly guessed Arnold's secret about Iggy, and also that they broke the promise they made with Arnold not to give away Iggy's secret. Unlike Iggy, this didn't get the two of them removed from the series nor does Arnold renounce them as his friends. It doesn't help that, unlike those two, this is the only instance Iggy got A Day in the Limelight, leaving his personality totally defined by this episode.
"Helga and the Nanny"
Unintentionally Unsympathetic: While Helga shouldn't have framed Inga for theft, it's hard to feel sorry for Inga after she spent the entire episode forcing Helga into a dress she clearly wasn't happy wearing and otherwise trying to control her life, regardless of how good her intentions were.
Values Resonance: Inga's initial handling of Helga's behavior involves her not getting mad when Helga "accidentally" spills glue on Bob's favorite chair. Helga fully expected Inga to get angry and was surprised that she didn't. Inga simply expresses relief Helga wasn't hurt when she heard the girl cry out, and explains simple accidents aren't something you lash out at a child over. Though Helga did do it on purpose, Inga didn't know at the time. In years after "Helga and the Nanny" aired, discussions started being held about the proper way to react when kids break or spill something, with Inga's attitude being surprisingly progressive for the time.
