In this scene, Josie and Vanessa are having a sleepover. While Vanessa is sleeping, Josie notices and is confused why Vanessa wears her necklace to bed. This foreshadows how the necklace will be important later on and throughout the book.
In this scene, Josie gets a note in her locker that says "Vanessa is Dangerous!" Although Josie thinks it is some kid who is jealous that she is friends with Vanessa, it actually foreshadows that Vanessa will lead Josie trouble to Beryl.
In this scene, Josie has a dream that she is in Beryl's house and runs into the room with the necklace in it and she figured the necklace turns dolls into humans. This foreshadows that Josie will need the necklace to turn Anna back human and defeat Beryl with it.