The word "Pittsburgh" is spelled wrong on the side of the news van shown at the beginning of the first scene.
Goof: The aliens give Colonel Elliot the coordinates of 118 degrees longitude 42 degrees latitude. Later, when he enters the coordinates into the computer, he set them to 32 degrees latitude.
Goof: Bobbie pulls some folders out from under her arm, then in the next shot pulls them out again.
Tim O'Connor previously had the role of Andros in "Judgment from Outer Space".