As Nathan becomes closer to both Haley and Lucas, his former sidekick Tim Smith becomes increasingly clingy to the point that other characters start joking that Tim is actually in love with Nathan.
Brooke once ordered two exotic dancers: One for Mouth and one for herself.
Brooke and Peyton go Skinny Dipping together in the Season 2 opener, and it's implied that it's not the first time.
Lampshaded by Rachel Gatina, for Brooke and Peyton.
Brooke: Hi, back-stabbing supposed-to-be-best-friend and all. Peyton: Hi, forgot-to-say-good-morning sneery-grouch-a-lot. Rachel: I'm outta here, over-possessive-best-friends-with-weird-lesbian-energy... and Haley.
When Peyton asks Lucas who he wants next to him when his dreams come true, Skills happily suggests himself.
In the Season 4 finale, there's a shot of the 12 graduating seniors paired up - Lucas and Peyton, Nathan and Haley, Brooke and Chase, Rachel and Mouth, Bevin and Skills, and... Junk and Fergie.
Brooke once jumped onto and straddled Lindsay, thinking it was Lucas in the bed. Lindsay then responded that hadn't happened to her since college.
Whilst trapped in the library, Mia suggests they say what they like about each other - Peyton and Brooke immediately list her boobs and lips.
Even Peyton seems to be aware of it, as in episode 5x12, Brooke tells Peyton she came back to Tree Hill because she wants to have a baby, and Peyton's response is a confused "...With me?"
When Lucas splits his and Peyton’s home down the middle, he accidentally leaves his cellphone on Peyton’s side of the house and she sends an embarrassing text to Fergie talking about how much Lucas misses him. Fergie’s not only happy to receive the text, but then turns up on Leyton's doorstep purely to see Lucas on the back of the message.
Sam lampshaded Brooke and Peyton's lesbian tendencies towards one another.
At Lucas and Peyton's wedding, there's a brief series of shots showing the various couples who aren't married; namely Mia and Chase, Mouth and Millie, Skills and Lauren, and again, Junk and Fergie. With the two of them glancing at one another.
Skills and 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.
Bevin kissing Rachel, supposedly to prove to Rachel (Who was contemplating the possibility that she was gay) that she wasn't gay.
