* AngstWhatAngst: Becoming pregnant at such a young age doesn't seem to faze Juno all that much, but then she is an overly flippant teen. Averted later following the delivery, where she seems actually relatively upset.
** For what it's worth, delivering a baby causes a HUGE hormone crash. Even terminating or losing a pregnancy fairly early on can cause some hormonal reaction, so 40 weeks of extra estrogen (and everything else) build-up to end fairly suddenly, well... talk to any woman who has given birth in the last few days and they'll probably start crying at some point. Add in the fact that Juno is 16 years old and relatively unprepared for what's about to befall her. While the scene with Juno is fairly heartbreaking, it's probably less about the whole situation and more just a very, very realistic depiction of postpartum reaction.
* SugarWiki/AwesomeMusic: The soundtrack. Barry Louis Polisar's "All I Want Is You" and The Moldy Peaches' "Anyone Else But You" are now [[SongAssociation inseparable]] from the movie. Music/SonicYouth's version of "Superstar" is also memorable.
* BaseBreakingCharacter: Vanessa is either a [[TheWoobie Woobie]] who wants to be a mother or a [[ManipulativeBitch Machiavellian]], [[ItsAllAboutMe self-centered]] {{Jerkass}} who isn't as altruistic as she presents herself. There's seemingly no gray area; people who see the film are either with her or against her.
** Mark is also either a [[TheWoobie Woobie]], or a massive selfish {{Jerkass}}.
* EsotericHappyEnding: One of most contentious examples in recent years; more than a few people have [[AbusiveParents very]] [[ParentalNeglect dark]] [[MyBelovedSmother interpretations]] of where Vanessa's relationship with Juno's son might lead. Though Vanessa is painted sympathetically for her desire for motherhood, many viewers have expressed doubt if she's really up to the task, seeing her faults as a character and her treatment of Mark as rather ominous indicators.
* GeniusBonus: While the movie mentions that Juno's named after the Roman goddess Juno, it doesn't mention that one of the main domains of the goddess is childbirth.
* HilariousInHindsight: After Ellen Page came out, it is ironic that Juno suggested giving the baby to "a couple of nice lesbos" or commented that she thinks the name Madison is "kinda gay".
* LoveItOrHateIt: Less the movie so much as the dialogue. Its quirkiness is either a huge part of its charm or deeply obnoxious.
* MisaimedFandom:
** Not by a whole lot, but pregnancy fetishists have a great admiration for this movie, especially the scene in which Juno enthusiastically rolls up her shirt for Vanessa at the mall.
** And then there's those that use the film as a tool to promote pro-life or pro-choice arguments with regards to abortion, when WordOfGod indicates that the film was meant to be neutral on the subject.
* NoYay: Mark and Juno, when they dance together.
** Mark and Juno in general. More than one viewer might have thought this movie was about to take a turn into ''much creepier'' adulterous MayDecemberRomance territory with the way Mark kept being so friendly to Juno and the way she kept spending time alone with him, but no, that's not what happens.
* RonTheDeathEater / TheScrappy: Vanessa is subject to this by haters of the film. Mark is by many people too.
* {{Squick}}: Oh, GOD. Those [[UnusualEuphemism PORK SWORDS]]!!!
* UnintentionallyUnsympathetic: We're supposed to sympathize with Juno who becomes pregnant at an early age. However, she seems oblivious of the consequences, [[AngstWhatAngst doesn't think it's such a big deal]] and it all works out for her in the end... [[EsotericHappyEnding kind of]].
** Vanessa could count, depending on your point of view. Though the movie presents her in a positive light, many audience members found her character traits and behavior off-putting.
* WhatDoYouMeanItsNotPolitical: In vain with MisaimedFandom above, there are pro-life activists who use the film as a tool against abortion, although Diablo Cody and Ellen Page are both pro-choice.
* TheWoobie: Depending on who you ask, Vanessa.
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