In this case, the writers need to get information to us — the audience — about the psychological conditions afflicting these hospital residents. How do they facilitate this? Susannah overhears her psychiatrist mention “Borderline Personality Disorder” to her parents, so to help her understand her diagnosis, the other hospital patients break into the doctor’s office where they all read their individual files. 

The writers make psychological terms and jargon dynamic by having the patients switch files with one another and read the doctors’ notes aloud. By reading each others’ files, the characters learn about themselves and each other. As a result, the readers/audience learn about them too.