In the motel scene, Violet knocks over the lamp by the bed while trying to turn it on. As she is being dragged out of bed the lamp is back on the table.
On Olivia's first night home, a rock gets tossed through the picture window. When her father comes out of his bedroom to check on the noise he is fully dressed and wearing fully laced up work boots when just seconds before he was asleep in bed.
As the protagonists drive into the hills, Noah relates that he was a Cub Scout and his "troop" would go camping in the area. Cub Scout units are organized into "packs", which are further broken down into "dens". Boy Scouts are organized into "troops" and "patrols".
The girls at the slumber in the beginning are, at best, pre-teens (10-12 years old). Later in the film it reveals that six years have passed, yet the girls involved are shown to be old enough to get into nightclubs and drink alcohol which would require them to be at least 21 years old in the US.
The pizza guy goes into the attic to check the breakers at the home when the lights suddenly go out. He is shown re-setting a breaker in what is a fuse disconnect. Breakers cannot legally or physically be placed in such an enclosure due to the risks of fire and electrocution.
Noah's last name is said to be Palmer but on his name tag while sitting at his desk it says N. Harris.