The Keys

Several of the kids have keys to the door that open from the tunnels, which is a symbol of the original purpose and design of the neighborhood. They have discovered that the key opens any door, which is a symbol of the lack of privacy and secrecy in the neighborhood as a whole. Later, Beth notes that Ed has an entire ring of keys that is meant to symbolize that he owns a lot of things. She feels sure he only owns a lot of keys.

The Lantern

The lantern is a symbol of Ed's control over Beth. He allows her to have the lantern while holding her in the basement, but warns that he will take it away if she screams.

The Copper Bracelet

Heather sees a copper bracelet when they see Maureen performing oral sex, and this becomes the symbol of the person...