The nurse tells Ferg that overhearing conversation and reporting it is unethical. There is nothing inappropriate according to HIPPA. HIPPA is about protection of medical issues not criminal charges.
Series regular Zahn McClarnon (Mathias) and guest star Eddie Spears (Elwood) have worked on several projects together, including: Into the West (2005), Comanche Moon (2008), Yellow Rock (2011), The Legend of Hell's Gate: An American Conspiracy (2011), and Bone Tomahawk (2015).
The movie Dreamkeeper (2003) has both Tantoo Cardinal (Crow Medicine Woman) and Eddie Spears (Elwood) in it.
Joel McKinnon Miller guest stars on this episode. He is a regular character on Brooklyn Nine-Nine. Lou Diamond Phillips was a guest star on Brooklyn Nine-Nine.