|Except for the "Pilot", each of the episodes are named after songs or albums. For the episodes that are named after songs, the plot of the episode typically relates to the lyrics in some way.|
|Production of the series began on August 12, 2003, approximately one month before the series premiered.|
|The working title for the series was Ravens, named after the mascot of the Tree Hill High team.|
|One Tree Hill films in Wilmington, North Carolina.|
|In the original version of the pilot, Lucas' best friend was named Reagan instead of Haley and played by Samantha Shelton, not Bethany Joy Lenz. After One Tree Hill was picked up by the WB and added to the fall schedule, the character was renamed to Haley James and was re-casted.|
|Episodes that do not feature the opening credits and theme song and feature the One Tree Hill logo instead are typically episodes that have a serious, more dramatic storyline such as the school shooting episode, "With Tired Eyes, Tired Minds, Tired Souls, We Slept".|
|Stars Chad Michael Murray (Lucas Scott) and Sophia Bush (Brooke Davis) met on the set of the series, dated, and married on April 16, 2005. They announced their separation on September 26, 2005 and subsequently filed for divorce. Their divorce was finalized in December of 2006.|
|Though James Lafferty's character (Nathan) has his nipple pierced, Lafferty does not. For each scene where Nathan is shirtless, a nipple ring has to be glued on.|
|James Lafferty is the only cast member that was actually a high school aged teenager when filming of the series began. Every other cast member was older than 20.|
|The baby who plays Jenny, Jake's daughter, is actually 4 different babies: three girls and one boy. Two of the girls are twins named Erin and Emily.|
|Artist Helen Ward draws all of Peyton's artwork used in the series.|
|One Tree Hill Musical Guests:|
- Gavin DeGraw: "You Gotta Go There to Come Back" and "What Comes After the Blues"
- Sheryl Crow: "The First Cut is the Deepest"
- The Wreckers: "The Hero Dies In This One"
- Jimmy Eat World: "The Tide That Left and Never Came Back (1)"
- Fall Out Boy: "An Attempt to Tip The Scales" and "Just Watch The Fireworks"
- Nada Surf: "Return of the Future"
- Jack's Mannequin: "Just Watch The Fireworks"
- Michelle Featherstone: "The Show Must Go On"
- Lupe Fiasco: "Can't Stop This Thing We've Started"
- Within Reason: "You Call It Madness, But I Call It Love"
- The Honorary Title: "In Da Club"
- Kate Voegele: Recurring throughout season 5 (first episode: "It's Alright Ma (I'm Only Bleeding)")
- Season 1 (2003-2004): Averaged 3.5 million viewers
- Season 2 (2004-2005): Averaged 4.3 million viewers
- Season 3 (2005-2006): Averaged 2.8 million viewers
- Season 4 (2006-2007): Averaged 3.0 million viewers
- Season 5 (2008): Averaged 3.3 million viewers
|Episode/Series Promotional Music|
- "Just The Way I'm Feeling" by Feeder -- used during trailers for the series premiere
- "Feel" by Robbie Williams -- used during trailers for the series premiere
- "Ride of Your Life" by John Gregory -- used to promote new episodes throughout the season
- "Hands Down" by Dashboard Confessional -- used to promote new episodes throughout the season
- "I Don't Want To Be" by Gavin DeGraw -- used to promote the first season finale, "The Games That Play Us"
- "I Don't Want To Be" by Gavin DeGraw -- used to promote the second season premiere, "The Desperate Kingdom of Love"
- "All Our Words" by Long Since Forgotten -- used to promote new episodes throughout the season
- "Just The Way I'm Feeling" by Feeder -- used to promote new episodes throughout the season
- "I Don't Want To Be" by Gavin DeGraw -- used to promote the third season premiere, "Like You Like an Arsonist"
- "Dance, Dance" by Fall Out Boy -- used to promote Fall Out Boy's performance in "An Attempt to Tip The Scales"
- "The Mixed Tape" by Jack's Mannequin -- used to promote Jack's Mannequin's performance in "Just Watch The Fireworks"
- "Chosen" by Robert Duncan -- used to promote the third season finale, "The Show Must Go On"
- "The Mixed Tape" by Jack's Mannequin -- used to promote the fourth season premiere, "The Same Deep Water As You"
- "It Ends Tonight" by The All-American Rejects -- used to promote new episodes throughout the season
- "Favorite Sin" by Within Reason -- used to promote Within Reason's performance during "You Call It Madness, But I Call It Love"
- "Good Vibrations" by Gym Class Heroes -- used to promote "It Gets The Worst at Night"
- "I Don't Want To Be" by Gavin DeGraw -- used to promote the fourth season finale, "All of a Sudden I Miss Everyone"
- "This Is Our Town" by We the Kings -- used to promote the 5th season premiere, "4 Years, 6 Months, 2 Days"
- "Mahabharata" by Radio America -- promotional music for "It's Alright Ma (I'm Only Bleeding)"
- "Coming to Terms" by Carolina Liar -- used to promote the 6th season premiere, "Touch Me I'm Going to Scream"
|During Brooke and Lucas' first date, Brooke revealed a tattoo. Sophia does not have this tattoo (or any other) in real life; rather it was painted on her. However, her mom called her up after watching the show screaming "Did you get a tattoo?"|
|One Tree Hill is one of only two shows to ever be allowed to play a Led Zeppelin song. The song was played during the third season finale, "The Show Must Go On".|
|Mark Schwahn on season 5:|
"It's one thing to talk about having dreams in high school, we all do. It's another thing to pursuit those dreams, or find that it’s not going to be as easy as you thought it was, but there's some voice inside you that compels you to try harder, compels you to keep pushing. The show has always been about what you want, what you’re willing to do to get it and what's right and wrong about the pursuit".
|Due to the 2007 WGA writers' strike, the episode order for season 5 was cut from 21 episodes to 18.|
|For season 5, the theme used for seasons 1 through 4, "I Don't Want To Be" by Gavin DeGraw, was not used. Instead, One Tree Hill written on a black background was used.|
|Is named after the U2 song of the same name. Creator Mark Schwahn was listening to their Joshua Tree album when the song came on.|