Other mistake: After Sarah gets Slappy into the locker he could see Tyler from inside but the problem is that the angle and the height of the vents are wrong for that perspective.
Goosebumps 2: Haunted Halloween (2018)
1 other mistake - chronological order
Directed by: Ari Sandel
Starring: Jack Black, Ken Jeong, Wendi McLendon-Covey, Madison Iseman
Other mistake: After Sarah gets Slappy into the locker he could see Tyler from inside but the problem is that the angle and the height of the vents are wrong for that perspective.
Trivia: The real RL Stein makes a cameo appearance as the principal Mr. Harrison who presents Sonny with his science award at the end of the film.