Trivia: After posting Obama signs in yards, Mason Sr got into his car and told Mason and Samantha, "Look, I'm a patriot, all right?" He drives away but the camera stays fixed on the now-visible Jeep parked on the opposite side of the street. This appears to be showing another kind of "Patriot" [Jeep Patriot], but it is actually a Liberty. (01:02:59)
Trivia: Originally intended for theatrical release, this film ultimately had to be released through streaming after the North Korean government threatened to retaliate against the United States. A cyber crimes group allegedly tied to North Korea also hacked Sony's emails and made threats against theaters that had planned to show the film.
Trivia: Part of the inspiration for the film came from a friend of writer/director Jennifer Kent. Her friend, a single mother, had a young son who like many children was terrified of non-existent "monsters" he thought were lurking in his home. Kent then had the idea to turn this into a film. What if a child was terrified of monsters lurking in their closet, under their beds, etc... except they were real?
Trivia: Funded mainly through the use of online crowd-funding.
Trivia: The fancy Mercedes is not "the only one in America" (as John Madec said on the movie) but the only one in the world. The car was borrowed for the purpose of the movie by one of the owners of the Formula One team McLaren and was shipped by air from Germany. Hence German licence plates often seen during the film.
Trivia: Paul Jesson and Timothy Spall play father and son in this film. In real life, Jesson is only ten years older than Spall.