When Iris attempts to retrieve the bag Paula drops on the bus, the small child who was sitting immediately in front of Paula vanishes. Iris immediately sits where the missing child was last seen.
Iris Chapman: Sometimes I thought about what Margaret said. About how a person can just drift through life like they're not connected to anyone or anything. You look around - all those characters trying to kill time. Going around in circles. Even if a person wanted to break free, they could find out they've got nowhere else to go.