Directed by: Fred F. Sears
Starring: Hugh Marlowe, Donald Curtis, Joan Taylor, Morris Ankrum
Revealing mistake: When Carol, Dr. Marvin and the others enter the alien spaceship it's obvious by the sound that that they are walking on plywood made to look like metal. (00:37:10)
Revealing mistake: As the alien's speak to Carol, Dr. Marvin and the others inside their spaceship, they use the exact same footage again of them looking at the video screen as they leave earth even though one minute of movie time has elapsed. (00:39:25)
Factual error: The aliens request a meeting with Dr. Marvin on the shores of the Chesapeake Bay, near Washington DC. However, the shot of him driving along the shore line shows mountains in the background, which don't exist in Eastern Maryland. (00:35:13)
Dr. Russell Marvin: Both Carol and I are subject to the same atmospheric disturbances that may have affected other observers, but there is a qualitative difference, when you're a scientist.
Trivia: Paul Frees is the apparent "spokesperson" for the aliens. His voice is heard throughout the movie. He's also the voice visitors hear in "The Haunted Mansion" rides at the Disney parks.