These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Ryan doesn't really seem all that bothered about Theresa losing the baby at the start of the second season. Or when he finds out she lied about it.
No-one other than Marissa is really bothered by Johnny's death.
Justified at the start of season 4 following Marissa's death - the season starts six months after the death, so the only people still struggling to move on are those who were closest to Marissa, i.e. Ryan, Summer, and Julie.
Base Breaker: Taylor Townsend, post-Heel-Face Turn. She's either loved for her personality post-Character Development and promotion to the main cast in Season 4 (and for replacing Marissa as Ryan's One True Love), or hated for those exact reasons.
Crack Pairing: "The Chrismukk-huh?" explores Sandy being married to Julie who is having an affair with Che
Crowning Music of Awesome: One episode usually consists of about five indie-rock gems, but "Hide and Seek", "Hallelujah", "Dice", "Life's A Song", "Something Pretty", "Running Up That Hill", "A Bad Dream", "If You Leave", "Champagne Supernova" etc. "California" is a given.
Designated Hero: Jimmy Cooper. The show repeatedly has characters talk about how good he is, and he's portrayed as the Reasonable Authority Figure in Marissa's home life, but he's still a white collar criminal who embezzled millions from his clients.
Designated Villain: Marissa and Summer immediately dislike Taylor the first time she appears in the show, and it seems like the audience is expected to dislike her too. However, since we haven't actually seen Taylor do anything villain-like, it just comes across as Marissa and Summer being bitchy for no good reason.
While Official Couple(s) Ryan and Marissa and (especially) and Seth and Summer are very popular in the fandom, many fans continued to ship Marissa with her short lived bisexual love interest Alex, long after she had dropped off the face of the Earth. It is also never made clear whether or not Taylor and Ryan ended up together, but the fans are nearly unanimous that they did.
The Seth/Anna shippers would like a word with you.
Seth/Ryan eclipsed any het pairs in popularity at several points during season one and two. This was addressed within the show as well as outside. Addressed as in nearly confirmed.
Ryan and Summer have become more popular in recent years.
Sandy & Kirsten are arguably the most popular pairing on the show, with anyone who dared to try & come between them being hated by the fandom.
Fridge Brilliance: If Harbor is such a prestigeous school, why don't they have uniforms? It's not hard to imagine that parents had the uniform abolished so their kids could wear their expensive wardrobes, considering the type of society Newport is generally depicted as.
As of Season 2 of Arrow, Marissa's sister basically grew up to become Hetero!Alex.
Chris Brown being was upset that Kaitlin offered him weed. Let that sink in for a minute.
In one of the final episodes of the series, Seth comments that he should become a critic since he loves watching movies & telling people how bad they are. A few years later, there would an explosion of internet critics who watch bad movies purely to riff on them & tell people how bad they suck; with Seth's snarky personality, it's not hard to imagine him being one of them.
Ryan & Marissa's fathers are both Hercules - Tate Donovan (Jimmy Cooper) voiced the character in Disney's 1997 animated film, whilst Kevin Sorbo (Frank Atwood) played him in the unrelated live-action Hercules: The Legendary Journeys. It gets even funnier when you realise Julie Cooper had children with both of them.
Jerkass Woobie: Kaitlin is kind of a bitch but she goes through a lot including being excluded from her own family for nearly two years and having her mom forget her birthday. That's not even counting the the deaths of Johnny and Marissa.
Les Yay: When Summer discovers Taylor in her bed at Brown, Taylor's first question is "Wanna snuggle?"
Memetic Mutation: Overdramatizing murder scenes with slow motion & Imogen Heap's "Hide and Seek" Explanation In [[the climactic scene of the second season finale, "The Dearly Beloved", Marissa shoots Trey Atwood in the back to stop him from killling Ryan. As soon as [[spoiler:the bullet hits, "Hide and Seek" begins playing, inadvertently replacing all of the drama with unintentional hilarity thanks to the sudden and out-of-place soundtrack.
No Yay: Despite how close they are, there is very little Marissa/Summer fanfiction.
Oliver Trask, who bypassed being a Love to Hate villain & became outright hated. Whilst it was in part because, after roughly half a season of build up to the Ryan/Marissa relationship it was promptly torn apart by Oliver, his hatedom extends beyond the Marissa/Ryan shippers. This is largely because the entire Oliver arc reduced the general intelligence of the entire cast (Marissa, especially) so they wouldn't believe Ryan's sceptism and draw the arc out for 6 episodes, and Taylor Handley's portrayal of the character wasn't subtle enough for the Manipulative Bastard he was supposed to be. And he had stupid hair, too. It's telling that over a decade after his last appearance on the show, Oliver is still appearing in "Worst Character" polls.
Johnny Harper. He was introduced at the start of the third season and began falling for Marissa, with the writers clearly hoping fans would take to him & create a Ryan/Marissa vs. Johnny/Marissa shipping war. However the fandom didn't take to him, and began to turn against the character as it seemed that was he receiving more screentime each week. Even when the writers took notice & finally wrote him out by having him literally fall off a cliff to his death, the fandom still complained with a number of fans feeling that it was the show's Jump the Shark moment with the show getting far too melodramatic.
Jimmy was supposed to be the cool parent for Marissa, but he generally came off as bland and unlikable. The writers took note and started featuring him less and less, before writing him out midway through the second season after he spent the majority of the season just floating around on his boat.
Seasonal Rot: Season 3, by many. Some say Season 2 as well. If you watched the show for Mischa Barton or the Ryan/Marissa romance, Season 4.
Ships That Pass In The Night: Some fans like to use Jodie and Summer as a Beta Couple to Marissa and Alex. They may have met during the week that Jodie stayed in Newport, even though this usually isn't a factor. This is probably because (at the time *After Anna and before Taylor*) Summer was the only other prominent female teen character.
They Wasted a Perfectly Good Plot: Marissa dies, and then... Season 3 promptly ends. Season 4 picks up several months later, skipping out the funeral & everyone's reactions to the news.
Unintentionally Unsympathetic: Jimmy Cooper. The viewer is supposed to feel sorry for Jimmy, as they watch his life rapidly falls apart in the first half of season one; however, the reason this happens is that Jimmy had mismanaged his family's money on the stock market, and then embezzled from his clients to keep up appearances & try to get back the money he lost in the first place. Subsequently, it's hard to disagree with Julie when she decides to divorce him & outright tells him that maybe he belongs in jail. It gets even worse retroactively, since Jimmy's actions are eerily similar to the actual stock market crash that occured a few years after the show finished.