Continuity: At the start, Robert Neville drives into some yellow poles only to drive into them again in the following shot.

Revealing: When the taxi goes over the edge to capture Dr. Neville, you can see that the underbody of the car as it goes over is a flat painted surface and not the underside of what should be there (i.e., muffler, gas tank, etc.).

Factual error: The grenade Will Smith uses at the end of the movie has a blue and brown colored lever. This feature is only used on the M69 practice grenade and not the real M67. The lethal grenade lever is completely green.

Continuity: Toward the end of the film Neville is bitten by a darkseeker in his house. When they get into the lab and close the strong glass doors you see Neville trying to think of what to do. At one point you can see that the bite switches from his right shoulder to his left.

Continuity: At the end of the movie, when Nevile is behind the glass and he is thinking and all the sound goes away, you can see the bite mark that the zombie gave him. While the shot is changing between him and the zombie, you can see the bite mark change sides of his shirt.

Revealing: When Dr. Neville first approaches "Fred" at the trap, we see the taxi from both sides as it sits on top of an intact railing. When the taxi starts to teeter over, there is now a section missing in the bridge that was cut out for the car to fall properly off and be at the right angle to "teeter" as well.

Continuity: When Will Smith sees Fred at the end of the road and is lured into the darkseeker's snare trap, before Smith actually gets caught and hung upside down (approaching Fred from the truck and shooting at him), the position of the sun in the sky, and angles of light in the scene, change dramatically in only a few minutes time.

Continuity: Will Smith is standing atop an airplane hitting golf balls. Sam sees a deer in the streets below. Will Smith picks up his gun and looks through the scope. When he does this the flashlight is on the right side of the gun. Later in the scene Will Smith and Sam follow the deer into the dark old bank, Will Smith enters with his gun raised, but the flashlight is now on the left side of the gun.

Continuity: At the beginning of the movie when he is driving his Mustang, the movie is shot inside the car several times. If you look carefully you can see that the same background scene has been used twice. In the scene, you see a red wall from a building and a grey car standing along that red wall. This scene is used twice.

Factual error: Robert Neville is a Lieutenant Colonel but his insignia in the shots portraying him in his military dress uniform are golden, which indicate the rank of Major.

Factual error: Neville shoots the propane tank in the kitchen, driving the darkseeker out into the hallway. Shooting a propane tank without an external source of ignition or a tracer would simply result in the tank's gas escaping and maybe the tank moving across the room. The Mythbusters needed an armor piercing rifle bullet to get through a tank and couldn't ignite it even with tracer rounds. Propane tanks are very thick walled. Bullet sparks are a movie myth. Bullets are either lead or lead in a copper jacket. Neither will spark when hitting metal.

Continuity: During the scene when the dogs are let loose to chase the injured Dr. Neville, the beam of sunlight is first 1-2' wide, then about 4-5' wide when the dogs try to cross, only to go back down in the next shot to about 1' wide.

Audio problem: During the scene where he is hitting golf balls off of the ship, he is hitting an iron. For anyone who plays golf, the sound that goes along with this is that of a driver or some type of fairway metal.

Continuity: The shirt Neville wears changes throughout the shots of him closing up the windows the first evening after he met Anna. They probably re-used shots from the first time he's seen doing that in the movie.

Factual error: The scroll on the news reports the Patriots beat the Giants for the second time in the season. This could never occur unless the game was the Superbowl, as an AFC team never plays an NFC twice in the regular season. The dates do not match up to the superbowl, held in February.

Audio problem: At the end of the movie when Neville is shooting at the darkseeker, he runs out of ammo and you hear repeated clicking as if the gun kept trying to shoot. He has an AR15 and the bolt locks back when the last bullet is shot. If he released the bolt he would get one click, but would have to recock the gun for every subsequent click.

Continuity: Just before Neville goes into the house with the creatures and instructs Sam, "So look, if I'm not back by dark, just go.". The camera show Neville reaching for the dog, it changes perspective and you can see Neville reaching again.

Audio problem: Just after the lion takes the deer Neville was hunting at the beginning of the movie, his watch alarm goes off to signal that it's getting dark. The watch alarm in the movie is a "beep-boop" two tone. As the owner of both watches Neville is wearing, I know that the watch we get a closeup of, a Swiss Army Sportech 4000, has a single (once per second) alarm beep and the watch on his other arm, a Hamilton Khaki X-wind, does not have an alarm.