As a favor to Dennis Hopper, Dean Stockwell, who plays Stig the car salesman, shot his scenes for free.
Dennis Hopper's wife, Victoria Duffy, played the Navy office worker who gets the flowers at the beginning.
The interior shots of the "navy offices and warehouse" were shot at the Square D Production Facility in Columbia, South Carolina. They also used employees of the plant as extras.
The ship going under the bridge in the climactic scene is the USS CARR (FFG 52), then stationed at Charleston Naval Base.