These facts are SCARY interesting (listen, I tried)!
“I said to Ari when that scene was coming up, ‘I will do it on a real desk, just tell me.’ And he said, ‘I love you and thank you but that is definitely not allowed,'” Wolff said. “So, he said, ‘We’re going to get a soft cushion desk.’ It had a foam top but it was hard on the bottom. I remember after, I was just panting, my voice is gone, blood is dripping down everywhere, and blood is gushing down my knee — real blood gushing down my knee because I slammed it against a chair. I couldn’t move my arm, my complete ankle was swollen — it looked like a balloon.”
Rolex permitted any character in the film to wear their watches EXCEPT for Christian Bale's Patrick Bateman, which resulted in the iconic line from the book, "Don't touch the Rolex" being changed to "Don't touch the watch" in the film. Also, when Calvin Klein pulled out of having their underwear featured during a rather gratuitous scene, Perry Ellis stepped in.
Writer/director Jennifer Kent has stated on occasion that the look for her top hat-sporting accidental gay icon was inspired by the classic film master of monsters, Lon Chaney. Specifically, his look in a sadly now-lost film, London After Midnight (as the prints were burned in the 1965 MGM vault fire). So, in a way, The Babadook is actually keeping his look alive today! Gotta love a happy ending!