Plot hole: The ending that Zach wrote was that all of the monsters got pulled into the manuscript but, Brent Green, the Invisible Boy, somehow managed to avoid being captured even though he should have been sucked in too.
Goosebumps (2015)
3 mistakes - chronological order
Directed by: Rob Letterman
Starring: Jack Black, Dylan Minnette, Odeya Rush, Ryan Lee
More quotes from Goosebumps
Trivia: The teacher who greets Mr. Stine at the end of the film is played by the real-life R.L. Stine in a cameo. Furthermore, his character's name is "Mr. Black," a reference to Jack Black, who plays R.L. Stine in the film.
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Answer: When they use the term "monsters", it isn't specially about evil creatures, it's anything R.L. Stine created in his books. All of Stine's creations were pulled into the book, including Hannah, who was never a real person. A ghost would be considered a monster, no matter how friendly or benevolent.
Bishop73