Rudy says working in a hospital gives him access to Valium. A prosthetist is not a doctor and would not have legal access to prescription drugs. ,,,although since he is a serial killer he would not be breaking his ethics to the steal drugs from patients or storage in the hospital where he works.
When they find the body parts of the prostitute, Dexter turns his head to the left, just after he says the word 'tree', his wire can be seen behind his ear.
Deborah says the hooker was to meet a client at the corner of Coral Way and Biscayne Blvd. however, these two streets never cross. Moreover, the map the cops are referring to shows the city of Coral Gables, not the Brickell area south of downtown Miami.