When pica is not caused by an iron deficiency, it is often "a disturbance in the thought process," according to Dr. G. Richard Locke, a gastrologist and motility expert from the Mayo Clinic.

Sheryl Lee, who played Laura Palmer and Maddy Ferguson, guest stars as Dr. Donna "Doc" Gooden, Dual Spires' psychiatrist, pediatrician, optometrist, gastrologist, podiatrist, dermatologist, orthodontist, forensic scientist, veterinarian, lawyer, and accountant.