Continuity mistake: In the beginning of the series, Haley's big family is brought up often, implying that she has 3 brothers and 3 sisters. When her mom visits her, Taylor and Quin to announce that she is dying, there is no mention of or visit from any other siblings and Lydia talks about those 3 as if they are her only children.
Continuity mistake: When Deb is telling Nathan that she started the dealership fire they show a reconstruction in which Deb has long hair but on the 1st episode of series 3 (the fire) you see her with shorter hair same as last episode in series 2.
Continuity mistake: Firstly when they start their senior year and you see Lucas and Hayley looking at their predictions, longish hair and no beard, then it cuts to them at school and you see Lucas with a hair cut and a beard,then in the next scene, he has no beard and long hair.
Visible crew/equipment: The scene where Lucas meets Payton on the side of the road with the tow-truck. Once they are ready to get into the truck you can see equipment in the middle of the road, as Payton starts walking towards Lucas. (00:28:50)
Visible crew/equipment: When Lucas meets Peyton by his tow truck there's a crewmember wearing a green shirt with arms and legs visible next to him.
Revealing mistake: While Lucas is in the shower and someone steals his towel and clothes, he walks out into the hallway holding two basketballs. When he turns toward coach Durham you can tell that Lucas has on nude colored underwear.
Deliberate mistake: After the party, in the scene where Lucas goes into the cafe, he finds Haley crying. The shot is a distant shot with Lucas and Haley in it. Haley's hands are covering her face. In the next shot, just of Haley, her one hand is over her forehead.
With Arms Outstretched - S1-E9
Continuity mistake: When Lucas is showing Keith his tattoo, in each shot the sleeve of his shirt keeps changing from rolled up to rolled down.
Factual error: When Lucas writes an email to Karen, we can see in the "To:" box that he typed "karen'scafe@hotmail.com". But the email can contain only letters, numbers, periods (.), hyphens (-), and underscores (_). It can't contain special characters nor accented letters.
What Is And What Should Never Be - S1-E20
Continuity mistake: Haley's lipstick gets noticeably thicker and thinner between different shots when she's talking to Nathan (when she drops over some groceries).
What Is And What Should Never Be - S1-E20
Plot hole: How in the world could Keith be hired as a teacher? Not only is he a college drop-out with no teacher training, Dan mentions just an episode or two earlier how Keith is incapable of using modern machinery (specifically saying how every high school graduate will be more qualified than Keith).
The Games That Play Us - S1-E22
Other mistake: In the last episode of season 1, Lucas goes to see Haley and Nathan where they tell him they got married last night, which must have been after the playoffs game. However, in season 2 in flashbacks of their wedding they got married during the day.
The Games That Play Us - S1-E22
Continuity mistake: Throughout the entire episode, Lucas' hair length ranges from being short to long.
The Desperate Kingdom of Love - S2-E1
Audio problem: In the flashback, when Hayley and Nathan are in bed together and it's raining outside, she says, "Well, maybe so," but her mouth is not saying those words. She smiles and closes her mouth.
The Truth Doesn't Make A Noise - S2-E2
Continuity mistake: Early in the episode, Lucas is listening to his Ipod on the river court. Later, Keith comes to his house and tells Karen that Lucas left it in his truck.
Revealing mistake: Brooke takes the towel off Nathan, but you can tell that he is not actually naked and is wearing boxers.
You Can't Always Get What You Want - S2-E4
Revealing mistake: When Dan and Lucas are racing Felix, from one scene to the next where the actors are replaced by stunt doubles. Close up, they are Paul Johansson and Chad Michael Murray, but from far away when the actual driving is happening, they are not the same people.
The Hero Dies in This One - S2-E13
Plot hole: When Dan asks Lucas how he managed to lie to Karen about his heart test results then successfully move out, Lucas tells Dan that he showed Karen Keith's test results letter instead. In a prior scene, Lucas hands Karen the results letter and she is elated to read no Hypertrophy issues. Being a very savvy business woman, Karen would have noticed the addressee on the letterhead was Keith, NOT Lucas.
Locked Hearts and Hand Grenades - S3-E6
Factual error: The NOFX CD Rachel gives to Peyton is titled "Drunk In Public". The real title is "Punk In Drublic".
The Worst Day Since Yesterday - S3-E8
Other mistake: At the start of season 3 it is established by Whitey that the lockers are in alphbetical order, hence why Nathan, Haley and Lucas all have lockers next to each other, but in this episode when Haley and Rachel decorated the Scott brother's lockers, Brooke then goes to her locker and is sad when she opens it as Lucas decorated it earlier in the season. Brooke's locker however is only a few lockers away from Lucas', even though they are meant to be in alphabetical order.
