Casting
In September 2013, it was reported that Jack Black was in talks to "play a Stine-like author whose scary characters literally leap off the page, forcing him to hide from his own creepy creations". Black stated that he tried to make the character "more of a sort of curmudgeonly dark, brooding beast master". He also said that he attempted to approach this film the same way he does others, trying to "make it as funny as possible". Black met with R. L. Stine to get his consent for the film, but determined that his character could not be too similar to the real one; Black explained that he needed the character to be more sinister. Rob Letterman was chosen as the director, reuniting him with Black, after working together on Shark Tale and Gulliver's Travels.
It was announced in February 2014 that Dylan Minnette had been cast as Zach Cooper, and Odeya Rush as the Stine-like author's daughter, Hannah. On February 26, 2014, it was announced that the film would be released on March 23, 2016. On April 4, 2014, it was announced that Amy Ryan and Jillian Bell had joined the cast as Cooper's mother and aunt respectively. On April 10, 2014, Ken Marino joined the cast as Coach Carr. On April 28, 2014, Halston Sage joined the cast. On May 1, 2014, the film's release date was moved up to August 7, 2015. Stine stated on May 20, 2014, that he was going to make a cameo appearance in the film.
The film was promoted at the 2014 San Diego Comic-Con where Jack Black and Rob Letterman interacted with Slappy the Dummy. Slappy even brought some of his "friends" out consisting of the Bog Monster from How to Kill a Monster, two Graveyard Ghouls from Attack of the Graveyard Ghouls, Cronby the Troll and a Mulgani from Deep in the Jungle of Doom, the Lord High Executioner from A Night in Terror Tower, Murder the Clown from A Nightmare on Clown Street, the Mummy of Prince Khor-Ru from Return of the Mummy, Captain Long Ben One-Leg from Creep from the Deep, Professor Shock from The Creepy Creations of Professor Shock, Count Nightwing from Vampire Breath, a Creep from Calling All Creeps!, a Body Squeezer from Invasion of the Body Squeezers: Part 1 and Part 2, Carly Beth Caldwell's Haunted Mask form from The Haunted Mask, a Scarecrow from The Scarecrow Walks at Midnight, and a Pumpkin Head from Attack of the Jack-O'-Lanterns. When Jack Black tells Slappy that it is him that Slappy wants, Slappy instructs the Lord High Executioner, Murder the Clown, and Professor Shock to take Jack Black outside to his car. As the monsters leave, Slappy tells Rob some of his pitches causing Rob to leave as well.
Some monsters due for an appearance in the film were cut for budgetary reasons, but Letterman stated that the crew tried to choose the monsters most appropriate to the story. Letterman also stated that he tried to combine both humor and horror in the film, commenting that "[t]he books themselves are legitimately scary, but they're legitimately funny, and we try to capture that". In November 2014, the release date was moved back to April 15, 2016. In January 2015, the release date was pushed forward to October 16, 2015.
