In addition, she interviewed dozens of Cal Tech students and based most of the stories in the film and the visual depiction of their school on Cal Tech, in particular Dabney Hall. Coolidge also met with all kinds of scientists and students, including the legendary Cal Tech mathematician grad that was rumored to have lived in the steam tunnels. To say that the director was a stickler for authenticity was an understatement. The graffiti in the dorm was copied from the actual dorm graffiti by scenic painters and then embellished further by Cal Tech students brought in by the production.
O'Neill, Patrick Daniel. "Martha Coolidge." Starlog. September 1985. Pg. 35-37.