Cybill Shepherd recalled in her autobiography "Cybill Disobedience" (2000) that it was "not quite the worst movie ever made but close" and that the cast were "a rather sad group of actors, all trying to resurrect our diminished careers. [Raymond Burr] read his lines off a TelePrompter."
Jan-Michael Vincent had problems with his alcoholism during the making of this film. For example, when Vincent failed to show up for work one day, director Greydon Clark had to convince Cybill Shepherd and Martin Landau to work on that day even though they weren't originally scheduled to do so.
One explosion in the film turned out to be much bigger than planned. The resultant fire burned out the electrical wires in the town where the movie was shot on location, thus causing a power outage which lasted for two hours. Greydon Clark subsequently had to pay for two hours worth of lost power.
Shot in three weeks.