Búho is Spanish for Owl.
Phone number that was given to Felipe (310-369-4951) was actually a real working phone number, that featured a recording of Katey Segal in character from "Sons of Anarchy"
After the Second World War, a large number of Nazi sympathizers fled to South America, Argentina in particular, to flee prosecution from war crime charges.
A representative of EZ's handler, was named Santiago Himmler. Heinrich Himmler was Adolf Hitler's Minister of the Interior, or State Security, who may or may not be a distant relation to the character.