At the beginning of the movie, Lacy locks the sliding-glass door by
moving the lock switch up. The next morning Daniel locks the slider
by moving the lock switch up. Later Lacy locks the slider by moving
the lock switch down.
When Mr. Ratner and Daniel are fighting on the the lawn, Mr. Ratner throws a punch with his right hand, but in the next shot he is throwing the same punch with his left hand.
When Daniel announces he has a new job, the flowers repeatedly jump back and forth between his hands and Lacy's hands between shots.
At the beginning of the scene in which Sammy's stomach bruises are discovered poolside, Karen and Shelly Jessop walk up to the pool. Shelly's sunglasses go from being worn over her eyes to being on top of her head from one shot to the next.
"A.C.E." is listed after cinematographer David Boyd's name in the opening credits. This stands for American Cinema Editors, of which he is not a member (he also isn't even a film editor). The correct letters to use would have been "A.S.C." for American Society of Cinematographers, of which he is a member.
The gun shop owner is describing different calibers of firearms to Daniel and he states a .243 Winchester A-Bolt as being a larger caliber. The cartridge is simply called a .243 Winchester - an A-Bolt is a model of rifle manufactured by Browning.
When Lacy cleans her son's room, she finds one of his drawings depicting himself holding hands with an alien. When she later shows this to her husband that same drawing shows three aliens.
While Lacy is on the phone after waking up from her blackout, and her boss calls her, while talking she looks at the phone to see the time, and the screen is what it should be when in a call on an iPhone. But then when the camera switches from her point of view to a third person perspective, she lifts the phone to her ear, and the charging battery icon can be seen briefly, along with the slider that shows on the lock screen, which wouldn't happen while on the phone.
When mother gives daughter her asthma relief puffer it's not pumped.
When the dad confronts Jesse's older buddy, he says "He's only 14." The caption under Jesse's photo at the end though says he's 13.
When the wildlife official, Janice Rhodes, is talking to Daniel Barrett she says they will perform an autopsy on the birds. Though autopsy can refer to animals, it is arguably more normal for the word necropsy to be used.