 GEOG: When Helen and Klaatu are going to the professors, the army  states that their cab is heading northwest on Connecticut at  Columbia Rd. The cab then passes under the Dupont Circle underpass  on Connecticut AV. The underpass is south of Columbia Rd, not north.  Also, if the professor lives near the State Department, they are  going the wrong direction. The State Department offices are south of  Columbia Rd.