Board Thread:General Discussion/@comment-35116663-20181013032641/@comment-26862374-20181013135807

Yeah there were a few:
 * In Sonny's room, he had plush toys of Stay Puft, Slimer, and Spider-Man sitting in a chair with Slappy.
 * When Slappy tells Sonny and Sam he can bring objects that he sees to life, he brings to life action figures of Ryu and Ken from Street Fighter as an example.
 * The Bride of Frankenstein was one of the monsters in the film.
 * Stine sees a red balloon and says, "Ha, I knew I came up with that first!" Referencing It

And besides the Goosebumps monsters that appear in the movie, Mr. Chu mentions Monster Blood, The Scarecrow Walks at Midnight, and Say Cheese and Die!