Ray is charged with "Felony Murder," which is the legal term for causing a death while in the course of committing another felony. Unless unauthorized tampering with hospital equipment is a felony, it's difficult to imagine what the "underlying felony" is supposed to have been in this case - Ray should have been charged simply with murder or manslaughter. The writers may have simply liked the sound of the phrase "felony murder" and used it without understanding what it meant.
Ray and others keep saying Mickey was Ray's nephew but he was his cousin. Ray had no siblings on his mother's side so no nephews or nieces.
Twice in JR's office, while meeting with the Cartel, JR refers to Andy Bradley as "Ed."