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Plot hole: Carol and Dr. Marvin walk into The Internal Security Commission at The Pentagon and he's stopped by the guard and made to show his clearance. The guard looks at him intently but lets his wife in without any challenge or ID check. (00:27:20)

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Continuity mistake: As Dr. Marvin tries out his high frequency ultrasonic gun in front of Maj. Huglin the engineer to the right of them turns on the generator. In the next shot the lighting has changed and the the shadow of Dr. Marvin's head appears on the pillar behind him. (00:47:00)

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Continuity mistake: At the Pentagon Carol and Dr. Marvin speak to the generals and one of them holds a pipe in his right hand. In the next shot he's holding the pipe in both hands. (00:46:15)

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Continuity mistake: After they've destroyed the alien craft spotted flying around inside of the Belmont lab, Dr. Marvin and the others decide to pack up and leave. Even though the sound has been edited out, the car and truck are already running with their headlights on before anyone gets into them. (00:51:50)

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Continuity mistake: Carol and Dr. Marvin are locked in the underground bunker at "Operation Sky Hook" as the power goes totally dead. Somehow in total darkness without any power we still hear the sound of the aliens speaking which is strange because if you look at the tape recorder it's not running at all. (00:24:40)

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Continuity mistake: Carol and Dr. Marvin are locked in an underground bunker at "Operation Sky Hook" and the doctor makes a tape recording of himself as the power goes out and the lights start to flicker. He says, "The batteries are failing, the recorder's not running up to speed" but if you look at the tape recorder it never slows down and keeps running at the same speed. (00:25:05)

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Continuity mistake: After leaving The Pentagon, Dr. Marvin and Major Huglin arrive at the doctor's hotel in broad daylight. In the next shot as he walks in on Carol sleeping in their room, it's the middle of the night. (00:30:15)

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Continuity mistake: At The Pentagon Internal Security Commission meeting a General asks, "Does anyone one want to have the recording played again?" and the two military officers standing in the back move to the left between shots, only to return several shots later. (00:27:45)

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Continuity mistake: Dr. Marvin runs out of their hotel room and proceeds to his meeting with the aliens by the Chesapeake Bay. Carol calls Major Huglin in his room and we see that the filmmakers used the same room for both shots with items such as paintings, beds, lamps and water pitchers moved to different spots. (00:33:10)

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Continuity mistake: Dr. Marvin and Major Huglin leave The Internal Security Commission meeting together and drive from The Pentagon to the doctor's hotel. Even though we just saw Carol and Dr. Marvin fly into Washington in an airplane he's driving the exact same make and model car that they were in at "Operation Sky Hook". Even the California license number AV-35-B7 is the same. (00:30:00)

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Other mistake: As they travail to The Pentagon in Washington, Carol and Dr. Marvin sit in the exact same mock-up of an airplane's interior that we saw earlier in the movie when a UFO passes in front of it. (00:00:45 - 00:27:00)

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Continuity mistake: There's no smoke inside of the alien spaceship but if you look closely before the motorcycle cop fires his gun, smoke from a previous take can be seen swirling above their heads. (00:42:30)

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Continuity mistake: The alien's show a Navy Destroyer being destroyed by their death rays. Later as it explodes we see the remains of an aircraft carrier. (00:40:40)

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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)

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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)

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Continuity mistake: The alien's speak to Carol, Dr. Marvin and the others and show them a Navy Destroyer on their video screen firing on an alien spaceship. If you look closely the guns on the ship are not aimed at the alien spaceship. (00:40:35)

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Continuity mistake: The motorcycle cop looks up at the alien's Infinitely Indexed Memory Bank and the front of his hair is combed up into a pompadour. In the previous shot it was combed down. (00:43:00)

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Continuity mistake: The alien spaceship's shadow falls on the sand underneath where Carol, Dr. Marvin and the others are looking at it on the bank of the Chesapeake Bay. In the next shot as they all walk into it they're in sunlight. (00:37:00)

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Continuity mistake: Carol's hair is parted in the middle as they stand and look at the alien spaceship as it sits on the bank of the Chesapeake Bay. When we see her inside the spaceship her hair is parted on the right. (00:37:00)

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Continuity mistake: The Motorcycle cop that is taken up into the alien spaceship with them asks, "What team has won the most World Series?". When he asks the question he takes his hat off which leaves a dark impression on his forehead, in the next shot it's gone. (00:41:40)

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