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.
Revealing mistake: Haley's pregnancy pad is visible when she raises her arms while lying on the table. (00:21:15)
Visible crew/equipment: When Peyton walks into her biological mother's big collection of records room, there is a man who is wearing shorts and white shoes in the room to the left in the shot where they just entered the room. (00:25:00)
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.
Everything in Its Right Place - S4-E11
Character mistake: Lucas is seen placing flowers on Keith's tombstone, which states he died on January 23, 2006. In the next shot Lucas places a single flower on the grave of Jimmy Edwards, who died the same day and in the same scene as Keith, yet his tombstone states that he died on March 1, 2006.
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).
Hate Is Safer Than Love - S5-E17
Revealing mistake: When Brooke goes in to the NICU to see Angie after her surgery, it is a doll in the incubator.
All of a Sudden I Miss Everyone - S4-E21
Continuity mistake: When all of the girls dance to the Spice Girls song "If You Wanna Be My Lover", during this scene Haley's shoes repeatedly change from high heels to trainers whilst she is dancing.
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.
The Games That Play Us - S1-E22
Continuity mistake: Throughout the entire episode, Lucas' hair length ranges from being short to long.
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).
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".
Continuity mistake: When Lucas is with Keith at the graveyard in 4-10 and Brooke is standing in front of "Peyton's" tombstone, it says she died on March 1, 2006. Keith notes that she died on the day of the shooting. However in this episode Lucas visits Keith's grave where his tombstone says he died in January 2016.
Every Picture Tells a Story - S7-E19
Continuity mistake: Nathan and Jamie are apparently playing Rock Band but when it cuts to clips of them dancing the TV is off.
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.
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.
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.
Continuity mistake: Nathan is watching Haley walk down the aisle, but when the camera pans to Nathan for a face shot, it is Lindsey's head that goes past the camera, and Lindsey he is looking at. (00:18:50)
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.
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.
