The Secretary of State provides the Iranian Ambassador with a letter she claims is a directive from her to the Office of Foreign Asset Control to take a certain action. The Office of Foreign Asset Control falls under the Department of the Treasury, not State, and therefor the Secretary of State would not be signatory to such a letter.
The exterior of the Beverly-Wilshire Hotel in Beverly Hills, California is used for the establishing shot of the Canadian Embassy in Washington, D.C. Both the "Wilshire Blvd." street sign and the California state flag over the hotel are clearly visible in the shot.