Jonas is trying to get into the room where the giver is and he is confused why. The lady figures out why soon after. It shows that thy have no locked doors in their community and that everything is open to everybody and that the community is so open yet has so many things behind closed doors.
"The locks are simply to insure The Receiver's privacy because he needs concentration,"
Jonas is running away to try to realest the memories to the people in the community. This shows that they care very much about him not releasing the memories and it shows that even if one person leaves they make it their top priority to find and release Jonas. As well how much security the community has.
When Jonas get assigned his job he is upset because in their community when they get a job they start becoming adults. And as one of the freedoms Jonas had when he was that he could hang out and play with his friends that is now getting taken away.