* HarsherInHindsight:
** Whenever anyone talks about Sylvia Plath's suicide at the age of 30 (only a month after the book's initial publication), you can expect someone to mention this particular quote from the novel: "How did I know that someday--at college, in Europe, somewhere, anywhere--the bell jar, with its stifling distortions, wouldn't descend again?"
** After [[spoiler:Joan's suicide]] and Esther's suicide attempt, Buddy Willard worries that there's something about him that makes women want to kill themselves. Plath's husband Ted Hughes found himself being accused of that very thing after both Plath and his partner Assia Wevill committed suicide.
* LesYay: Esther discovers Joan and [=DeeDee=] in bed together.
* TearJerker: If you can relate to Esther, then you may get teary-eyed as her condition worsens.
* VindicatedByHistory: The book was first published in London in 1963, and didn't get published in the United States until 1971. Initial reviews weren't particularly generous; now it's taught in high schools and colleges.
* WhatDoYouMeanItsNotForKids:
** Just as studying Creator/WilliamShakespeare might put you off his plays for life, having to analyse Sylvia Plath's poetry in detail was the bane of some UK students' A-Level years. These poems are definitely not for anyone younger than 16, either.
** Some younger readers might be put off by the scene immediately following Esther's deflowering, where she suffers massive bleeding, and Joan can't find a doctor because it's the weekend. Once she gets to an ER, the doctor fixes it easily. He doesn't say what the problem is, but she probably had a rupture in a small artery.
* TheWoobie:
** Esther and Buddy. Esther's an understandable {{Woobie}} while Buddy's more subtle. Think about it: he has TB and his girlfriend's happy about it, he has a painfully honest understanding that part of his appeal is his attractiveness, and Esther basically rejects him on the grounds of him giving an actually honest answer to her personal question of him having an affair (though that doesn't negate the fact he still had one...)
** Not to mention that he did actually respect Esther much more than she lets on, taking her to the hospital when his colleagues thought women shouldn't be allowed in. And the fact he actually tried to understand her (by writing poetry) and be romantic. They seem to have something vaguely resembling a reconciliation at the end though.
---> Buddy: Let me fly with you.
** Later, when she along with Joan were sectioned, he was frightened he drove women crazy.
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