The picture was made for $150,000, (of which $75,000 went to Jack Palance and Martin Landau as their salaries), and was filmed in three weeks.
The alien head was created by special makeup effects artist Rick Baker. According to producer / writer Daniel Grodnik, "It cost me $19,000 to have Rick Baker - in his kitchen - make that alien head. And that was what was used on all the posters and everything else. So, it was worth it."
The plot for the Arnold Schwarzenegger sci-fi/action film Predator (1987) also features the same idea of an alien from outer space that hunts humans. The same actor who plays the alien in "Without Warning," Kevin Peter Hall, also plays the Predator.
The shack with the bodies in it was the sole set built for this movie.
The extreme close-up shots of the flying creatures digging into various people were filmed by a three person crew in Greydon Clark's garage.
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