In addition to the unseen radio announcers, there are only 7 characters in this movie - the family and the gas station attendant.
Chris Mitchum's son Bentley Mitchum would later star in Demonic Toys, another movie produced by Charles Band, the producer of The Day Time Ended.
Was riffed by Jonah and the Bots in the 12th season of Mystery Science Theater 3000. The reboot was on Netflix. Episode 1204