Ryan records Chloe on his cellphone at the pier and she tells him that he is "irresponsible, self-centered, and completely childish". When he watches the recording in the truck, she never says "self-centered".
As Ryan drives through the construction site with the window completely rolled down, mud splashes up against the car and covers the entire driver's-side door as well as the windshield, yet Ryan remains completely free of any signs of mud.
When Ryan is in the boathouse, he does not appear to be wet after diving into the water.
When real-estate agent/husband is at the bank safety deposit box, he pulls his key from what is clearly a box far too small to have stored the camera bag he withdrew.
When Ryan robs the store to get a charger for his mobile phone, he connects the charger to the phone in his car. A few moments later the charger is gone.
When Jessica Martin clicks the wires together to make a phone call, she first has wires apart and then tapped them together to make contact for very brief seconds. This is contrary to how pulse dialing telephone systems work. In real life, she'd have to do the opposite. The wires should make contact, and then break contact very rapidly for the number the caller wants to dial.
At Santa Monica Pier, Chloe catches Ryan when he's talking on the phone to Ethan. The cops come, but Ryan jumps off the pier and into the sea, then comes out of the water and hides inside a warehouse under the pier. And when Ethan is about to kill Mooney, Ryan calls him with his cellphone. Unless the Nokia 6600 were waterproofed he wouldn't be able to make that call.
When Officer Ethan is going through the security screening at LAX, a gun is discovered. He flashes a badge and security lets him through. In reality it would take more proof than just flashing a badge to convince a TSA agent that Ethan was a police officer.
The Nokia 6600, used by Ryan, would only take a minimal charge during the time it was plugged in the charger and nowhere near enough to keep it powered for as long as it does.
The Nokia 6600 Ryan uses to record the video of the kidnapper executing people supports a maximum of 176x144 pixels when recording, but the clip displayed on the phone has a much higher resolution.
When Ryan steals the school security guard's car, he drives off without having to switch gears; the car would have been in park or neutral.
When the mobile gives a low signal, seconds later in the attic the moving shadow of a crewman is visible; Kim is the only one there and she's not moving.
When Jessica escapes from the attic, as she hops in the SUV, the Steadicam can be seen when she closes the door.
When Ryan jumps into his truck early in the film, when he closes the door a crew member wearing a hat is clearly visible in the side window.
As Ethan and his hitmen take Jessica hostage and drive up to their safe house, the camera crane is reflected on one of the cars.
Camera reflected on the blue Porsche, after Craig reverses the car and heads off to LAX.
When the shooting occurs at the Santa Monica Pier, the responding officers are from the LAPD. Since the pier is within the Santa Monica city limits, the correct responding agency would be the Santa Monica Police Department, not the LAPD.
When Sgt. Mooney enters the patrol car and enters Jessica Martin's information into the computer, he specifies Brentwood (a neighborhood in Los Angeles). The computer returns an address with "Brentwood, CA 90049". The city of Brentwood is actually in the Bay Area (over 300 miles away). The computer should have returned an address in Los Angeles, California.
There is no Wyman School in Brentwood,CA when Jessica Martin tells Ryan on the phone where her kid's school lets out.
The road Ryan is driving on to the school is Riverside Drive along the 5 Freeway located on other side of town.
When Sgt. Mooney goes to Jessica's house to investigate whether she was actually kidnapped, he is greeted by Dana Baybeck, who is pretending to be Jessica. Later when he sees the news report about Ryan, he calls Jessica's house and hears her voice on the answering machine. It is only then that he realizes the difference between the voice of the real Jessica and the woman who answered the door. However, Mooney should've already noticed the difference between the two voices because he had spoken to the real Jessica when Ryan handed him the phone at the police station earlier on. Did he forget what she sounded like that quickly?
After Ryan calls Ethan to make a trade at the Santa Monica Pier, Ethan calls Jack and tells him to bring Mooney so he can identify him. How does Ethan know that Mooney already saw Ryan?
When Jessica exits the car at the end after Ryan beats up the last thug and sees him for the first time, she seems to know right away that it is him. However, Jessica has only talked to Ryan on the phone up to this point, and has no way of knowing what he looks like, thus no way of knowing for sure this is him.
When Jessica cuts the goon's arm, she tells him that he will bleed 30 liters per minute. The blood flow through a brachial artery is nowhere near that much. During vigorous exercise the entire heart puts out a total of 30 liters per minute, but that's the sum total flow through every artery of the body. The flow though a single brachial artery is fraction of that. In addition, the goon was not vigorously exercising. At rest, the cardiac output is about 5 liters per minute.
At LAX airport, when Ryan steals someone's boarding pass, the security only checks his boarding pass and does not ask for any ID like they would at the real LAX.
Jessica's husband leaves a message to meet her at a bar in LAX but this bar is beyond security checkpoint and Ryan must snatch a boarding pass to get through security so it would have been impossible for either of them to meet at the bar without a pass.
When Jessica is speaking to Officer Mooney, she clearly states that five men broke into her house. There were only four men involved and a female officer (Baybeck) who was not shown until after Jessica was taken to the safe house. Only three of the four men were shown entering the home.
In the scene where Craig (Richard Burgi) is brought to the attic, Kim Basinger starts to say "Richard."