Director Jennifer Kent holds the rights to the film. When asked if there would be a sequel, she said, "I will never allow any sequel to be made, because it's not that kind of film. I don't care how much I'm offered, it's just not going to happen."

When asked where the idea for The Babadook (2014) came from, director Jennifer Kent said, "I have a friend who's a single mother, whose son was traumatized by this monster figure that he thought he saw everywhere in the house. So I thought, 'What if this thing was real, on some level?' So I made Monster (2005) [a short film] about that idea. But I couldn't leave it alone. I kept coming back to it. And that led to The Babadook."

The movie had a campaign where you could buy a copy of the hand-created "The Babadook Pop-Up Book" for eighty dollars. The first two thousand copies are numbered and signed by the director, Jennifer Kent. The book contains pop-up pictures, as well as additional pages not seen in the movie. The campaign was only open for a limited amount in which roughly 9,500 books were sold.

William Friedkin, director of The Exorcist (1973), said of this film, "I've never seen a more terrifying film than The Babadook (2014)."

In Hebrew, ba-badook means "he is coming for sure."

Of the film's total budget of $2.5 million, $30,071 was raised via Kickstarter. Most of the funds raised from Kickstarter were channeled toward the art department.

The Babadook (2014) is based on the short film Monster (2005). The director called it the "baby babadook."

The classic Italian horror film Black Sabbath (1963), which was directed by Mario Bava, can be seen on a television at one point. The following scene in the movie is of close resemblance to the aforementioned film.

According to writer and director Jennifer Kent, the Babadook was designed based on stills from the lost film London After Midnight (1927) starring Lon Chaney.

Director Jennifer Kent mentioned (at 0:31:18 in the DVD featurette "Cast and Crew Interviews") that they auditioned eight and nine-year-olds for the part of Samuel, but there was a knowing quality that crept into their performances that precluded the innocence the filmmakers were seeking. She also mentioned that Noah Wiseman was six years old both when he auditioned for the role of Samuel and when the film was shot.

Director Jennifer Kent and Essie Davis attended drama school together.

This was the debut theatrical feature film of director Jennifer Kent.

The film became a meme and symbol for the LGBTQ community after Netflix accidentally placed it under "LGBT movies."

In a few scenes where the Babadook is present, a sound effect from "Warcraft II" (Warcraft II: Tides of Darkness (1995)/Warcraft II: Beyond the Dark Portal (1996)), a computer game by Blizzard, can be heard. The effect was a calling response of dragons in the point and click strategy game.

In the birthday party scene, the adults are all wearing shades of gray/black, the boys are all wearing blue, and the girls are all wearing pink. The mother, however, is wearing a pink dress under her black coat.

Graphic designer and illustrator of the pop-up book "Mr. Babadook," which Amelia reads to Samuel, was Alex Juhasz.

Another of the sound effects heard in a couple of scenes was from the early nineties masterpiece in gaming UFO:Enemy Unknown (X-Com).

Director Jennifer Kent was extremely sensitive about introducing the themes of the film to child actor Noah Wiseman. During the three weeks of pre-production, she carefully gave him a child-friendly version of what the story was about. Wiseman's mother was on set throughout filming, and Wiseman himself was never actually present on set during scenes in which Essie Davis' character abuses her son; Davis instead delivered the lines to an adult actor who stood on his knees. Kent is quoted as saying, "I didn't want to destroy a childhood to make this film."

This film marked a rare achievement for characters in a horror movie: everyone alive at the beginning of the film stays alive at the end (excluding the dog).

A vocal sample from the opening cinematic of the Playstation 1 game Resident Evil can be heard multiple times during the final confrontation.

The scream heard repeatedly towards the end is that of Motaro, a character from Mortal Kombat 3 (1995).