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Visible crew/equipment: After Maj. Huglin shoots and kills the alien it's ship attacks a bomber and you can see the wires holding it up as they reflect the stage lighting. (00:57:05)

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Continuity mistake: The alien translating device from the helmet that Dr. Marvin places on the table is not the same one he was just holding. The shade, shape and shadow on the table all change between shots. (00:59:50)

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Continuity mistake: Dr. Marvin and the others stop the car and watch the alien spaceship that shows up landing outside the Belmont lab. At first the car is parked on an angle then in the next close-up shot it's on level ground. (00:52:00)

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Visible crew/equipment: After Dr. Marvin drives to his meeting with the aliens by the Chesapeake Bay we see a long shot of him walking on the beach with nothing else in sight. In the next close-up shot he walks through and equipment shadow that shouldn't be there. (00:35:35)

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Continuity mistake: In their spaceship the aliens use the infinitely indexed memory bank beam to read Gen. Hanley's mind and his hair is combed and his face is dry. In the next shot his hair is messed up and his face is sweaty. (00:24:20)

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Audio problem: After Prof. Kanter is incinerated by the alien's beam, Maj. Huglin points his shotgun at the alien and fires. If you look closely he pulls the trigger the first time and the gun misfires and you can see the recoil but not hear anything. (00:55:45)

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Continuity mistake: Prof. Kanter is incinerated by the alien's beam and his cane falls down next to him. The next time we see his smoldering body the cane has been moved and is now touching a tree to the right of the screen. (00:55:05)

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Continuity mistake: As the motorcycle cop gets his brain scanned by the aliens Infinitely Indexed Memory Bank the brain we see is the same one we saw when Gen. Hanley's got his brain scanned earlier in the movie. (00:24:25 - 00:43:10)

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Continuity mistake: As they speak to the aliens inside the spacecraft look closely as the motorcycle cop draws his gun twice before he shoots at the aliens. (00:42:45)

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Continuity mistake: Dr. Marvin says the batteries are dead on the tape recording that he makes, yet several shots later the lights behind Carol and he are back on. (00:25:50)

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Continuity mistake: Carol and Dr. Marvin walked into The Internal Security Commission meeting together. In the next sequence of shots inside the room she disappears, and when Dr. Marvin and Maj. Huglin leave the meeting together she's nowhere to be seen. (00:29:35)

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Visible crew/equipment: Dr. Marvin tries out his high frequency ultrasonic gun in front of Maj. Huglin and if you look very closely you can see the tip of the flair that they used to blow up the cement block sticking up above it before it explodes. (00:47:05)

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Continuity mistake: Maj. Huglin walks in as Dr. Marvin works on the high frequency ultrasonic gun and says, "Hello". Another engineer works to right of them and in the next shot he disappears. (00:47:40)

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Audio problem: An alien craft is spotted flying around inside of the Belmont lab above their heads and Maj. Huglin picks up and throws a wrench at it. We see the wrench hit the support girder near the ceiling but the sound is a second late. (00:50:20)

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Visible crew/equipment: Dr. Marvin decides to try out his new improved magnetic interference unit on a real alien spaceship that shows up outside the Belmont lab. As the truck with the device on it pulls up you can see the reflection of the crew in its door. (00:51:50)

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Continuity mistake: Maj. Huglin walks into the lab as Dr. Marvin works on the high frequency ultrasonic gun and all the equipment behind them is lit up. In the next shot it's not. (00:47:40)

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Continuity mistake: After Chris is startled by the exploding flame in the attic there's a shot of a priest caring flowers into the courtyard of a church and if you look closely the flowers on the right are the same in the close-up but the flowers on the left are not. When he walks into the chapel the flowers are rearranged again. (00:31:20)

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Continuity mistake: Several authentic looking prop newspapers have headlines reading that "Operation Sky Hook has been wiped out" and they all have the same mistake, no date on top. (00:26:40)

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Audio problem: After Chris is startled by the exploding flame in the attic there's a shot of the bell tower of a church as a priests carries flowers into the courtyard. If you look closely the bell we hear overdubbed from the tower is not moving. (00:31:05)

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Continuity mistake: Dr. Marvin tries out his high frequency ultrasonic gun in front of Maj. Huglin. Before he fires it the device is moving, than in the next shot it's still. (00:47:05)

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