When Officers Ryan and Hanson pull Cameron and Christine over, Officer Hanson turns his light on while still in the car. When they are out of the car, his light is off, but in a later shot the light is on again.
When Daniel is leaving his daughter's room after the cloak story scene, he pauses at the door to look at her. The light switch is in the down position and the lights are on. We see the daughter in bed with the lights on, and then cut to Daniel about to leave the room where the light switch is still down, and he pretends to flip it down as the lights go off.
When releasing the illegal Asian immigrants from the stolen delivery van, the internal cage door is open. In the next shot, it is already closed when the outer van doors are shut, even though nobody closes the cage.
When Graham is investigating the Conklin shooting, the blood stain pattern and bullet hole position on the Mercedes window is different between the pan out view of the dead driver and when Graham approaches the vehicle and picks up the gun.
In the beginning when Graham is examining the shoe with his pen, he touches the top near the laces. Later, when the movie comes back to this scene and he is examining the shoe, his pen touches a different part.
When the gun store clerk is listing the "types" of bullets that will work in the gun, he says ".45 long Colt". This is a caliber not a type and too large a caliber to fit this revolver. A later closeup of the box of ammunition confirms the gun is a 38 special.
Kim Lee is not a Korean name. It is just a mixture of two family names. When Koreans use the two words for a name, they use different pronunciations. Common pronunciation of the words are Geum and Yi.
Shaniqua tell Officer Ryan his father's urinary tract infection is not an emergency, even though she tells him she's not a doctor, she's informing him the policies and standards of his insurance carrier doesn't consider this an emergency.
When Officer Ryan tells Shaniqua Johnson his father's janitorial company lost business because the government gave the minority owned companies preference to city contracts. Even though this wouldn't have happened because the government cannot demonstrate favoritism, Ryan was only embellishing and exaggerating what happened so Shaniqua would approve his father's medical coverage.
Partway through Officer Ryan's rescue of Christine from her overturned SUV, the camera ran out of film, as evidenced by film sprocket holes appearing in the frame. This is an acknowledged goof from director Paul Haggis.
When Cameron pulls over to the street corner to let Anthony out of the car (after their run-in with the police), you can see Anthony's legs getting out of the car. Then they are back in the car talking and only then does Anthony get out.
When Officer Ryan is helping his Dad in the bathroom, he pulls down his Dad's underwear but when Dad sits on the toilet he is still wearing his underwear, [you can see the elastic band].
The police cars have subtle difference from real LAPD patrol cars. The real cars will have "To Protect and to Serve" on the door, to the right of the City Seal. The cars used this film have "To Serve and Protect" and its writing is to the left of the city seal.
Ludacris' character is seen riding the metro bus. The sound effect of the bus engine does not match the model of bus as the sound is of an old diesel with manual transmission. Tne buses of that model year ran on natural gas and had automatic transmissions.
When Daniel comes in to speak with Farhad after fixing his lock, two members of the production crew can be seen attempting to hide behind one of the store shelves in the bottom-left corner of the frame.
When Cameron is sitting alone in his car, just before he's approached by Peter and Anthony, a crew member in a baseball cap is visible in the car window as the camera approaches the vehicle.
In the credits, Matt Dillon's character is listed as Officer Ryan, but he consistently wears sergeant stripes throughout the movie.
Since Daniel already knew Farhad isn't fluent in English, instead of constantly saying "I replaced the lock", he could've just said "I fixed the lock", then Farhad would've been satisfied as a customer and therefore resolving the misunderstanding and Daniel would be paid for his services.