(a) Has Elliot ever called Benson "O"? It's always "Liv". But the text message began "O." This doesn't raise her suspicions? Nor does she call him back to see why she's needed. Crack detective.
(b) By coincidence, I watched "The Godfather" on Wednesday. In it, Vito is in a hospital that seems to have no patients/staff on his floor. Michael goes to his father, sees that he's alone, and starts yelling "I need help" in the empty corridor. Sound familiar? Angela also is alone on a hospital floor that seems to have no patients/staff on her floor. Elliot goes to see her, then goes out into t