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.
A contingent of fans shipped Chad Michael Murray & Sophia Bush, largely because of their former real life relationship. Considering these fans were usually Brucas fans shipping their characters, Chad gets a lot of flack from some of the shippers, with them blaming his divorcing Sophia for the end of Brucas sometime later.
Nathan trying to kill himself - Is he a selfish jackass doing it because he can't play basketball, or is he doing it out of fear that he's going to become a Generation Xerox of Dan?
Is Dan Scott genuinely trying to atone for his mistakes, or just doing it for a quick buck?
Brucas fans view Peyton as a whore who intentionally broke up Brooke & Lucas so she could have him for herself. See Shipping Goggles below.
Author's Saving Throw: After the 2007 Writer's Strike caused production on One Tree Hill to be halted (Much like every other show in America that season) after episode 5x12 was completed, The CW ordered 6 more episodes to round out the season & finish the plot arcs for Season 6 to start fresh.
Alex Dupre, who actually hijacked another character's plot in Season 8 after Jana Kramer decided to launch a music career, and the producers decided that Alex was now also a singer, in addition to being an actress & model.
Jamie was considered cute and adorable in the beginning, but some fans started getting tired of him especially since he seemed to get more and more screen time, even more than his parents. However to be fair, Jamie getting more screen time was at least partially a case of Real Life Writes the Plot, due to Bethany Joy Galeotti being pregnant & going on maternity leave during Season 8, forcing Haley to have a vastly reduced role during the later episodes of the season.
Designated Hero: Lucas for much the first two seasons. Aside from going between the two same girls and essentially wrecking their friendship, he also had the nerve to sleep with another girl around the same time, abandon his loving mother in her time of need to move in with the asshole father who abandoned him and refuses to acknowledge him and sabotaged the close relationship between the brother who originally hated him, but they were working getting to know each other and love one another as family.
Peyton for Brucas fans. She may be easily the poster girl for this trope.
Similarly Brooke for some Leyton fans. Though it was much more evident before season 6; after that Leyton fans have simply resorted to remarking "We won. Sincerely, Team Leyton" rather than getting into an argument on the matter.
Intentionally invoked with Chris Keller - Fans initially liked him, thinking he was there to be Peyton's new love interest, until they realised he was there to cause problems for Nathan & Haley, at which point this happened. The show would later invert this situation with Julian, by introducing him in a way that made it appear he was there to cause problems for Lucas & Peyton, before revealing he was there as Brooke's new love interest.
Season 2 can be considered this, thanks to a number of reasons - Felix & Anna largely being unliked by the fandom, the season ending by hitting a Reset Button on Lucas & Nathan's relationship, little to no progression with the Brucas or Leyton ships, and Haley being absent for a large part of the season. Many people considered the only worthwhile things to come out of the season to be Brooke's Character Development & Chris Keller.
Draco in Leather Pants: Ian Kellerman, you can still find people arguing his innocence even after he admitted to being the driver who nearly killed Jamie & Brooke in episode 8x11. Just to be clear, it's not a case of the evidence pointing to him, it's a case of him outright admitting this when confronted about it.
Ending Fatigue: For some, the Grand Finale - Gavin DeGraw performs "I Don't Wanna Be" at Tric's 10th Anniversary show, with the Season 9 cast in the crowd singing along, interspersed with shots of the group (And their children) hanging out at Karen's Cafe after hours. Then the final Time Skip occurs, with the cast attending a Ravens basketball game & repeating the closing monologue from episode 5x13, over shots of them standing & cheering as the Ravens come out on to the court.
Brooke was initially introduced to be a female friend for Peyton and wasn't even in the show's pilot. Regardless, she grew to be a major character and by the end of the series, was the only character to appear in every episode (Well, not counting the pilot).
This was also the case with Millie - Initially, she was only supposed to be in one episode, but the producers liked her so much they brought her on full-time.
Fridge Horror: Sawyer being sick during Brooke and Julian's wedding might only be seen as an excuse because Chad Michael Murray and Hilarie Burton can't come. But if you consider Lucas having HCM or even Peyton having Placenta Previa, not to mention Peyton's critical state when she gave birth to her, it's possible Sawyer being sick is a lot more serious than simply a little girl not feeling weel enough to fly to a wedding...
Lucas giving Julian relationship advice about Brooke in "Searching For A Former Clarity" is this when you realise Chad Michael Murray (Lucas) divorced Sophia Bush (Brooke) & she had since begun a relationship with Austin Nichols (Julian) in real life. Before the show ended, this could be seen as Hilarious in Hindsight; however, after the end of the final season it was anounced that Bush had split up with Nichols & moved the scene fuller into "Funny Aneurysm" Moment.
The jokes about Chuck's mom being an alcoholic became this when Season 9 revealed that Chuck's father abuses the two of them. No wonder she turned to alcohol.
Two examples, both without dialogue - In the Season 4 finale, there's a shot of the 12 graduating seniors paired up - Lucas & Peyton, Nathan & Haley, Brooke & Chase, Rachel & Mouth, Bevin & Skills, and... Junk & Fergie. Likewise, at Lucas & Peyton's wedding, there's a brief series of shots showing the various couples who aren't married; namely Mia & Chase, Mouth & Millie, Skills & Lauren, and again, Junk & Fergie. With the two of them glancing at one another.
Skills & Mouth saying "I love you" to one another. Whilst trying to gross each other out of the apartment by walking around naked.
In Season 8, Skills gets a mannequin made. And specifically asks for it to resemble, and names it after, Lucas.
Tim is this to Nathan, so very much.
Hollywood Homely: Millie! Millicent Huxtable was made out to be a complete Plain Jane who guys never really looked at, until she met Mouth. Millie is actually very beautiful, but apparently no guy could see it because wearing glasses somehow makes you invisible to every guy except Mouth. Apparently, nobody in the One Tree Hill Universe has ever heard of the Meganekko trope before.
Hollywood Pudgy: Sophia Bush has said in interviews that she is considered the "curvy" one in the cast, which is pretty ridiculous.
Peyton can also be considered something of a Sympathetic Sue given the fact that she has an almost hilariously angsty background, and that if anything bad happens to someone, then it's going to be to her. There's elements of Damsel Scrappy there too, given how often she manages to get into dangerous situations and needs rescuing.
Moral Event Horizon: One of the clearest cases in any media. Dan Scott - all around Jerk Ass, bad father, and Corrupt Corporate Executive, but nothing too bad. Until he kills Keith - his own brother - in cold blood, pins the murder on Jimmy Edwards, and uses Keith's death to worm his way back into Lucas & Karen's lives.
Dear God, so many. The first was arguably Naley, for Nathan/Haley, which has actually been referenced in the show. Others include: Leyton (Lucas/Peyton), Brucas (Brooke/Lucas), Jeyton (Jake/Peyton), Brulian (Brooke/Julian), etc. Brulian has also been name-dropped on the show by the (female) Alex.
Peyton/Lucas sometimes go by Pucas by people who ship Brooke/Lucas
As of now, an intense debate is going on concerning what the Quinn/Clay shipper name should be.
Replacement Scrappy: Clay & Quinn for Lucas & Peyton. Not helped by both characters being a pastiche of various characteristics that Lucas & Peyton had.
Rescued from the Scrappy Heap: Dan Scott who went from a utterly dislikable villain (and a murderer) to a more human Jerkass Woobie from season 5 onwards (mainly thanks to his interactions with Jamie) and finally to the main hero in season 9, according to pretty much everyone, his Crowning Season of Awesome.note Although considering that Dan nearly tortures someone to death and kills numerous people during his rescue of Nathan, calling him a "hero" might be something of a stretch, as he fundamentally remains an Unscrupulous Hero overall.
The Lucas/Brooke and Jake/Peyton fanbases. On the other side of the coint, the Lucas/Peyton and Brooke/Julian fanbases usually (but not always) coincide.
Meanwhile the Naley fans can get along perfectly with any of the above shipper groups. Or they can Pass the Popcorn while the other shipper groups fight.
Shipping Goggles: Brucas fans have a habit of vilifying Peyton and arguing that it's all her (And to a lesser extent, Lucas's) fault that Brooke & Lucas split up at the start of season 4, with Brooke being completely blameless. Never mind that Peyton was willing to hide her feelings for Lucas if Brooke were to admit that she was in love with Lucas, and that it was Brooke who wasn't willing to fight for the relationship.
Ship-to-Ship Combat: The Leyton vs Brucas war (which started in Season One) is one of the most infamous examples and is still going on, even after Lucas and Peyton got married and had a kid, with Brooke as the bridesmaid and godmother!
Some Anvils Need to Be Dropped: The Psycho!Derek arc can basically be summed up as advising the viewers to be careful about how much of themselves they put online, as anyone can see it. Bonus points for occurring as social networking was about to take off.
Unintentionally Unsympathetic: DEB. Although we can understand how cruel Dan was to her and Nathan, what gave her the right to sit passively by while he continued to torment them, throw herself into her work to avoid him and her son, become angry at and jealous of the only real bright spot in Nathan's life (Haley), and try to kill Dan, which indirectly caused him to later kill Keith, who he thought try to kill him? Even her alcoholism didn't really win her any compassion from the fans (or her family) since she was a Jerk Ass before and during it and her only purpose after overcoming her disease was to be a babysitter and occasional hook-up.
Clay Evans - Met the love of his life, married her & had a little boy together... And then she suddenly dropped dead in the kitchen, and Clay was so traumatised by this, that he blocked out all memories of his son & took several years to even accept his wife's death.
Peyton, for everything that happened to her in the first four seasons & her backstory.