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: Carla Azar plays the drummer Nana. She is a real drummer and plays in a band. She plays beside the drums, bass, guitar and keyboard, and sings.
Trivia: Katie Holmes plays Brenton Thwaites' mother in the film, even though in real life she's only 10 years his senior.