In this episode we see the name of Nancy's school, "Keene High School". Carolyn Keene is the author of the Nancy Drew series.
The term "Natural causes" doesn't bear any particular significance in medicine, so no coroner would ever use it in a death certificate; cardio-respiratory arrest is the usual preferred term.
This episode aired on Kennedy McMann's birthday.
"Carolyn Keene" is the pseudonym used by contracted writers who produced the Nancy Drew book series.