User blog comment:ErnestoCabral2016/What monsters will appear in the film?/@comment-28171460-20180712042245


 * >Francine from It's Alive! It's Alive!

That book is set to release months after the film, so it probably isn't her.


 * >It could also be a Splatter from Earth Geeks Must Go!.

But Splatters were just tiny bugs.


 * >Freddy Martinez from Vampire Breath

The vampire looked like an adult, and Freddy is supposed to be a kid. I think there was an adult vampire in Please Don't Feed the Vampire!


 * >The gummy bears could clearly be part of the living Halloween decorations. Although there is a possibility that they come from a Give Yourself Goosebumps book

There are no quotes related to gummy bears in any of Stine's books (barring any super obscure stuff). Google Books lets you search through almost everything he's written.