Ow does the film North by Northwest convey espionage from the 1950s?

Teachers general instructions:
In a 6-8 page essay, deepen our understanding of a literary work or other cultural artifact from the early Cold-War era in the United States by examining it in the context of the culture of the period. Alternatively, deepen our understanding of the culture of the period by reference to a work of literature or other cultural artifact.
My instructions:
If you could show that Alfred Hitchcock brings light and irony to the serious concept of cold war espionagealso a specific analysis of a scene from the movie would be ideal. Using 2 primary sources to show evidence and example of the era and two secondary sources which interpret the movie. Thank you!!