YMMV / Let's Get Invisible!

• Accidental Aesop: Don't peer pressure your friends or else it can harm them.
• Growing the Beard: This book successfully introduces a more mysterious Greater-Scope Villain, as well as being the first genuine ensemble piece that had its main adolescent character's actions be noticeably influenced by a more grounded social dynamic - which made the consequences of the story despite all its supernatural elements feel much more human and believable than ever before.
• One-Scene Wonder: Max's bickering grandparents, especially for the many Epileptic Trees theories about the origins of the magic mirror that came from it.