Trivia: At the Oscar ceremony in 2017, the film was accidentally named Best Picture, instead of true winner Moonlight, when presenters Warren Beatty and Faye Dunaway were accidentally handed the wrong envelope. Such a gaffe had never occurred in the Oscars' history before.
Trivia: Although they play mother and daughter, Laura Linney is only 10 years older than Amy Adams.
Trivia: Jason Mewes was originally set to play the "Brahtzies", but had to drop out due to finding the makeup required for the roles far too claustrophobic.
Trivia: When two food products run for cover during the end of Firewater's and the Non-Perishables "Great Beyond" belief story, you can hear the Wilhelm scream.
Trivia: When Lockhart is in the sensory deprivation tank, the nurse that does a poor job of keeping an eye on him is reading "Der Zauberberg" by Thomas Mann, which obviously has at that point a common premise with the movie (the main character goes to a sanatorium in the Alps just as a visitor but ends up as an inmate). The novel was inspired by Mann's visit to his wife at a Swiss sanatorium which happened in 1912, same year as the picture fully unveiled in the finale.
Trivia: Spoilers: At one point during the climax, you can briefly see a creature with long arms and legs barging through a doorway for a split-second. Many viewers assumed that this was the titular "Blair Witch." However, the screenwriter has stated that any creatures/specters visible in the film are meant to be grotesque manifestations of the witch's past victims (with the long-limbed creature presumably being Heather given she's in the place where Heather died), and that as stated earlier in the film by one of the characters, nobody can actually "see" the witch herself.
Trivia: Despite receiving prominent billing, Jonah Hill is only in the film for three minutes.
Trivia: On Paterson's bed stand, there is a photo of a younger Paterson during his military service. This is an actual photo of Adam Driver from his time in the United States Marine Corps. (00:01:40)
Trivia: When one of the Galactic Rangers' robots falls off a platform, he yells a Wilhelm scream.
Trivia: In his address to his crew, Nicholas Cage says "Without me, you are worthless. You are my crew. And without you, I am worthless." This line is borrowed from Full Metal Jacket (1987): "Without me, my rifle is useless. Without my rifle, I am useless."
Trivia: The film was originally written to be an introspective, existential dramedy geared towards adults about a troubled man who is turned into a cat. As originally planned, the cat also wouldn't speak/the audience wouldn't hear his thoughts. However, after a change in leadership at the studio, the film was rewritten into a more generic family movie.
Trivia: The line "he'll stop doing it" "stop doing what?" followed by violence was used almost identically in Iron Man 3, also written and directed by Shane Black.
Trivia: When Tripp is talking to his truck and he says "you'll have the heart of an elephant", it refers to the nickname hot rodders called the 426 Hemi V8 from 1966-1971, called the "Elephant Motor" for its massive size and weight. It also made 425 horsepower, which Tripp incorrectly states that the engine he pulled out of the truck made.
Trivia: Although Jennifer Saunders and Julia Sawalha play mother and daughter, Saunders is only ten years older than Sawalha.
Trivia: "Keeping Up with the Joneses" was originally meant to be a sequel to the film "Mr. And Mrs. Smith," with Brad Pitt and Angelina Jolie both intended to return. However, Pitt and Jolie were dissatisfied with the screenplay and dropped out. Eventually, all connections to that film were dropped and the movie was retooled to be a stand-alone film.
Trivia: The first leading lady role for Michelle Rodriguez since 2000's Girlfight.
Trivia: Eddie is given a heartfelt pep talk by his idol Matti Nykänen, the Finnish ski jumper. Nykänen actually spoke no English at all.
Trivia: Steven Seagal does not say his first line of dialogue until 48 minutes into the movie.