- "Common Knowledge": Nothing ever comes at night... except for Will trying to break into the house in the first act. And Stanley the dog that eventually returns after running away - sick.
- Critical Dissonance: The film, much like The VVitch before it from the same company, is adored by critics, but largely rejected by general moviegoers. The film is certified fresh on Rotten Tomatoes with an score of 86%, whereas the Audience score is 43%. The film also managed to earn a somewhat rare "D" rating from Cinemascore. It's believed that a good portion of the negative response, much like with The VVitch, comes from the marketing selling a different kind of horror movie than it actually is.
- Darkness-Induced Audience Apathy: This might just be the most depressing post-apocalyptic movie since The Road, even managing to be more depressing since at least The Road had a somewhat hopeful ending. See Ending Aversion for more details.
- Epileptic Trees: A literal case: many are convinced that the trees had something to do with the events of the film given that Stanley disappears in them and Travis and Andrew separately draw rather creepy pictures of them.
- Ending Aversion: Though most audiences probably weren't expecting a happy ending, the actual ending was Shoot the Shaggy Dog levels of depressing.
- Moral Event Horizon: Paul and Sarah cross it toward the end when they kill Will and his entire family under the suspicion they could be infected.
- Nightmare Fuel: The Nothing Is Scarier aspects of most of the film count; for instance, it's never revealed if there are any survivors aside from the main cast, which makes the ending incredibly bleak. There's also the question of what Stanley was barking at.
- True Art Is Incomprehensible: A lot of audiences were left scratching their heads by the time the credits started rolling. What was "it"? Was it a living being or a deadly virus that "comes at night"? Why did the aspect ratio thin whenever something bad was about to happen? Should this movie even have been called "It Comes at Night"? Whether you liked it or not, this movie is one big Mind Screw.
- The Woobie: Poor Travis.
YMMV / It Comes at Night