Factual error: In the opening scene that shows San Francisco scenery there is a shot of a large TV tower called Sutro Tower. The film takes place in 1960 and Sutro Tower wasn't built until 1973.
Factual error: The movie is supposed to take place in 1960, but the oscilloscope on the metal detector outside the wood shop is a new 1979 model, the year the movie was made.
Factual error: Guards are shown dressed with dark ties. In actuality, they all wore red ties.