Corrected entry: Although it has been 450 days, the wife has a calendar to track her pregnancy. Who printed that calendar if it has been more than a year since the demise of civilization?
Corrected entry: In the opening scene in the pharmacy, the deaf daughter has long braids which disappear for all other scenes.
Corrected entry: Though the film takes place over many months, the crops in the field near the house never seem to change appearance.
Corrected entry: How could the deaf daughter have the rocket that caused her brother's death? He had it in his hand when the alien attacked. It is somehow in perfect condition in her drawer.
Corrected entry: The parents set up fireworks as a noise distraction but this has to be triggered remotely, away from the house. Surely there are other ways that noise traps can be set which can be triggered easily from the house. Or from a remote control. They have plenty of electricity.
Corrected entry: When the power to the Abbotts' home goes out, the hundreds of colored lights and all of the cameras and monitors in the basement continue to work normally. This would have required either a really large generator (which would have made noise) or an incredible number of backup batteries, which weren't available to them.
Corrected entry: How did the Death Angel reach the basement while it got flooded? It seems to have magically appeared, and never took the staircase.
Corrected entry: If the aliens are sensitive to sound, and a simple high pitch sound can distract and hurt their hearing, the army could have figured this out long ago and defeated them with ease.
Corrected entry: The opening grocery store scene shows father, son, and wife leaving after the father tells the son no to the toy. Less than a minute later the boy is back in the grocery store when the sister gives him the toy and tells him to shush.