When Ana is in the bathroom in the beginning, trying to get away, the lock on the window is in the down, locked, position. In the next shot that shows the window it's in the up, open, position. In the next shot she flips the lock up to open the window and opens it.
When Ana is pulling up to her home, you can see Vivian
skating through the curve in the overhead shot. However, when she stopped at her driveway, the layout of the neighborhood shown in the overhead is different than in the level shot, and the cars in their neighbor's driveways are different.
When Luis jumps onto the windshield in Ana's car in the beginning of the movie, he spits up a bit of bloody saliva. When he goes to punch the windshield in, the spit disappears but reappears precisely where he punched the glass in, even though there is a few inches separation between the two spots. Later in the sequence, the bloody spot disappears again.
After Ana falls into the tub in the beginning there is a close-up that pulls out showing her feet with her toenails obviously painted, yet in the next shot, which is a first person point of view shot you can clearly see that her toenails are not painted at all. This painted nails vs. non-painted nails is shown throughout this scene.
As they get on the buses to escape the mall, Michael angrily takes the keys to the boat from Steve. But later on Ana risk everything to go and get the boat keys back from Steve's pocket, which should have been in Michaels possession.
When the bus driver tries to take Ana's car, she uses her left leg to push him away while presumably her right foot is planted on the accelerator. However, the shot from inside the car shows her right leg bent as if it's resting on the center console.
When Andy tries to fend off the zombies that get into his store (after Chips brings the food and radio), he shoots the door and the sliding panel that the zombies use. Later when they rescue Nicole, we see the bullet holes in the door, but the panel is undamaged.
When Ana is in her car behind the bus, just before the driver tries to steal it from her, there is a shot of a nude woman stumbling past on the right hand side of the front window. There is a heavy smearing of blood on the window, obviously covering up the nudity. Only Luis' hand-prints on the left hand side had been visible before that point and it isn't there after she wakes up from the crash, either.
When Ana runs into the restroom after being attacked by Luis in the beginning of the movie, we see the overhead shot of her falling into the bathtub. If you see closely the rug by the tub is folded in by Ana as she falls in, but when she gets out of the tub and we see her foot go down on the rug, it is normal.
When Ana is making her escape from her husband, he chases her until being distracted by and attacking a woman in a blue housecoat in a nearby front yard. About a minute later, as Ana navigates the carnage in her neighborhood, she passes the same woman standing in a front yard.
After the opening credits, Ana and Kenneth are seen walking down a paved walkway next to a park. Off to the left, there is a red child's bike lying on the walkway. They then pass through a tunneled section of the walkway, and the right side of the walkway behind them is clear. But after Andre shoots at Kenneth, a blue adult bike appears on the right side of the walkway behind them.
When Andre and Michael go outside to save the people in the truck, Michael shoots a Zombie when Andre's gun is empty. Michael aims at the zombie's stomach when firing, but we see the zombie getting hit in the head (which is far too high).
As they finish dinner and the power goes out. Kenneth cocks his shotgun. He does this again when he joins the party going to the generators, and again when they hear something in the garage. Shotguns do not get cocked more than once.
After the opening credits, Ana and Kenneth are seen walking down a paved walkway next to a park. Off to the left, there is a red child's bike laying on the walkway. They then pass through a tunneled section of the walkway, and we can see that the right side of the walkway behind them is clear. But after Andre shoots at Kenneth, we see a blue adult bike appears on the right side of the walkway behind them.
When Chips, the dog, is being lowered from the roof of the mall, to send Andy some food, he is secured with a red hook. The hook is latched in the first scene, but when Chips lands on the ground the latch is missing.
When Ana is driving through the suburban streets and passes a burning car, on the left side you can see that the adjacent street has not been wetted down to match the rest of the streets. Also, crew members and neighborhood spectators can be seen standing on the non-wet street and looking at the action being filmed.
In the scene during the birth of Andre and Luda's baby the shot switches between close-ups of Andre and Luda's faces. During one of the close-ups of Andre there is a cameraman and his camera clearly visible over Andre's right shoulder.
The film is set in America but was shot in Ontario. During a shot of a dinner table, you can see the French logo for Kentucky Fried Chicken, PFK (Poulet Frit a la Kentucky). By law, Canadian products contain descriptions and company names in both English and French. The French side is visible.
Film is set in Milwaukee Wisconsin but the license tag on the
ambulance at the beginning reads Ontario (the actual filming location). Also, the ambulance is painted in the livery of the Ontario Ministry of Health.
The call letters for the Milwaukee, WI television station covering the zombie attacks shown on the monitors in the mall were KBEX. The call letters should've started with a "W." For the most part, stations west of the Mississippi begin with "K" and stations east of the river begin with a "W" (like WGN in Chicago and WTMJ in Milwaukee). This mistake is also evident during the opening credits on the sign behind the news anchors and on the microphone of the on-location reporter. However, there are some exceptions to the "K-W rule"; KDKA, the first commercial radio station in the US and its TV affiliate, KDKA-TV, are in Pittsburgh (the rules for naming stations came later). Some stations in cities located on the Mississippi river (such as Minneapolis-St. Paul MN) may have their physical facilities on the "wrong" side of the river. However, all stations broadcasting in Milwaukee start with "W".
The United States has the broken lines on the inner part of the center turn lanes, since Canada has the broken line on the outside part of the center turn lanes, as an aerial shot of a 5-lane thoroughfare is depicted in a scene where a car is seeking refuge from the zombies. The Greater Milwaukee area in real life however, has no 5-lane (center turn lane) thoroughfares.
When the group goes into the parking garage to turn on the generators they never make it. They are instead confronted by zombies who they douse with gasoline from a pump and set on fire. If there was no electricity in the garage then the gasoline pump wouldn't work.
There are two massive explosions in the movie, at the beginning while Ana is driving away from her house and at the end when CJ blows up the propane tank, but the environment is obviously not affected by the shock waves. For example, in the beginning the trees do not move; and in the latter, the water remains still.
When the survivors escape in their armored buses as the dawn breaks, they are set upon by a horde of zombies. If you look closely, when one zombie is shot down, his shirt rides up slightly, revealing a very human, very healthy looking stomach, and not at all rotten like his face.
When Ana is escaping in the car and driving on the long
street, we see a van crash into another car and throw it off the street before it explodes; though he should have been visible through the gaps between the houses, the van appears as if from nowhere at a very high speed, making it clear that he was digitally built in.
In the DVD extra, Andy's lost tapes, we see Andy get bitten as he is trying to get the food from the dog. He dies in front of his camera and rises again and knocks the camera off angle, however in the actual movie, he is shown standing on top of the roof holding up a sign with blood on it, and he appears to turn just seconds later. This cannot be proved, however in the lost tapes he never returns to the roof to hold up the sign.
When the survivors are first escaping in the buses they get stuck and so C.J jumps on the roof with a standard sized propane tank with a flare. He then shoots this propane tank and an extremely large explosion occurs, then later when in the buses on the wharf he uses his last moments to shoot a much larger propane tank which emits a much smaller explosion. Clearly the first explosion was digitally added and thus is very dramatized and the latter is a stunt which is a realistic explosion.
When C.J. pops the roof exit hatch to throw the propane tank, it comes all the way off, instead of swinging up and away as it's designed to do. In the overhead shot after the explosion, the hatch door isn't visible on the roof, but a few shots later (driving through the streets), it's back in place.
When Monica is cut in half, her top is ripped from her body by the chainsaw, leaving her half naked. When Ana looks at her bloodied body lying on the floor, her cut ribs are visible but her shirt is still on the body.
When Andre and Norma have their shootout when Luda is
discovered to be a zombie, the shell casings from Andre's 9mm pistol land neatly at his feet while he's firing his gun, almost as if they are being dropped by hand at about waist height. In reality, 9mm shell casings eject up and to the right or left, not straight down
At the end of the movie just after Ana takes Steve's keys and is running for the truck she ducks a zombie women but there is a male zombie near her. He switches sides between camera shots and he touches her as if to grab her but lets go he is obviously hesitating to give her time to get on the truck.