Continuity mistake: The first time at the station, Sweetu looks back at the camera representing Aman with a confused look on her face, mouth open a little bit, teeth clenched. During the Heartbeat instrumental song when they show a flashback of the same moment with Aman in the shot, Sweetu looks at him with a big smile on her face. You can see this because when her face turns her mouth is visibly wide open and her lips are curled upward. (00:10:35 - 00:20:40)
Factual error: All UK driving test instructors must wear a yellow reflective waistcoat or jacket while instructing someone during their driving test. This was still true in 2002 when the film was shot.
Continuity mistake: As Nicolas Cage is smoking a cigarette in his car when his daughter comes into view for the 1st time. The camera angle flips between him, him with her in the background, to his key, back to him, and back to him with her in the background. Each time the angle changes so does the length of his cigarette. The time span is only a matter of 10-15 secs as she walks up and then starts to walk away, but his cigarette ends up being longer than when she walked up. (00:25:25)
Continuity mistake: At the very beginning of the movie, in the shot where Val Kilmer is unconscious and lying down on the ground, he first appears with his right hand facing up, then facing down, then facing up again.
Revealing mistake: When Dae-su enters the room of one of his nemesis, his computer screen shows information about the stock exchange. The Internet address on the screen is: C:/DocumentsandSettings/[.]/OldBoy/[.], which would be a link to a folder on that computer, not an Internet address.
Audio problem: When John confronts Selima about the baby and they've walked out of the house and down the steps, from the side of her face you can see Selima's lips moving even though there is no sound coming out.
Factual error: Fairfax was not present at the trial of Charles I, although his wife Anne was, (and was forcibly removed after telling the court what she thought of them).
Audio problem: When Galleria is playing the piano by herself at school, it's obvious she really isn't playing. Her hands are moving way too slow for some of the parts and at the end, her hands are playing very low on the bass notes when the notes heard are in middle-low C range.
Continuity mistake: When Isabelle arrives in front of Roxy's apartment, you can see the cab driver close the trunk after he removes Isabelle's bags, but when Charles-Henri hands the driver his bags a moment later the trunk is still open.
Revealing mistake: The shots of the aircraft in flight (carrying the liver) at the beginning of the film have been flipped. The "tail number" of the plane is visible and is obviously backwards.
Continuity mistake: Curtis is helping Molly seal the windows by screwing them shut. He hands the drill to Molly and she holds it up by her chest. When Claudia walks into the room Molly lowers the drill down in front of her below her waist. Then there is a quick cut back to Molly and Curtis as he says, " well that should do it", and the drill is back up in front of her chest again as she lowers it down a second time.
Revealing mistake: Katie Holmes appears to have a bandage on her finger way before she actually gets hurt. When Bobby hangs the turkey drawing on the door and she kisses him goodbye, the bandage is on her finger, but it's not until she peels the potatoes that her finger is cut. (00:14:25 - 00:24:50)
Continuity mistake: In the beginning when the text of the book is seen the format of the date of the peoples death is MM/DD/YY later in the movie the dates are seen again and the format has changed to DD - MONTH - YYYY.
Continuity mistake: When Pancho and Frank are bathing in the lake, you see an Italian Horn on Frank's necklace. The camera angle changes and it is now a medallion.
Revealing mistake: In the scene where Phil Kaufman is in the hospital searching for Gram Parsons' body, he pulls back the sheet covering the body and the actor playing the corpse moves his eye - the right one to be precise.
Factual error: When Griet is introduced to the camera obscura, far too much light is projected onto Vermeer's and Griet's faces. Camera obscuras don't make their own light; rather the image produced on the viewing screen is always dull.
Continuity mistake: In the "No Problem" scene, Alex lights up a cigarette while waiting for Isaach and then leaves it in the ashtray. Later on, when Isaach finally arrives, Alex offers him a cigarette and lights one for himself. The cigarette left in the ashtray disappears in the next shot.
Factual error: The final episode of "The Lucy-Desi Comedy Hour" when Lucy meets Ernie Kovacs, marks the finality for Lucy and Ricky Ricardo, and Fred and Ethel Mertz. By this time the shows weren't filmed before a live audience the way it's depicted in the movie. The producers of the show abandoned the live audience earlier than the final shows.
Continuity mistake: When Fin meets Emily in the Mill Bar, the amount of beer in his glass goes up and down without him buying a round or replenishing his glass.
Visible crew/equipment: When they unearth the cadaver, you can see in some shots that he wears a blue string. One of the men even sees it and tries to hide it subtly.