The movie was performed on live television in black and white and required two sound stages on the Warner Brothers studio lot. Harvey Keitel had to run between the two stages for some of his scenes.
The big board depicting the bomber's position was designed to automatically compensate for the actors accidentally jumping ahead in the script.
In the archive footage, the bombers (which are called "Vindicators" in the novel) are actually B-58 Hustler supersonic bombers.