Continuity mistake: Between the second and third shot of the movie the cockpit of the jet changes in the close-up. (00:00:20)
Continuity mistake: The telegraph report says that the UFO they're following is traveling in excess of 2000 mph but when they show the jets speed gauge it's only going 650 mph. (00:00:25)
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)
Continuity mistake: The UFO flies right over the cockpit of a United Airlines jetliner but does not leave a shadow. (00:00:45)
Continuity mistake: The aerial shot of Carol and Dr. Marvin driving up to "Operation Sky Hook" shows a flat desert. In the next close-up shot of them inside the car we see a hilly terrain through the rear window. (00:02:40)
Visible crew/equipment: Carol and Dr. Marvin drive by the "Operation Sky Hook" sign and you can see the shadow of the camera on it as they pass. (00:02:50)
Visible crew/equipment: As Dr. Marvin tries on the alien helmet, he looks around the room and a non-acting crewmember appears in the back of the room, standing to the far right against a concrete pillar, observing the filming. (00:03:00)
Continuity mistake: When the Marvin's start necking as they drive to "Operation Sky Hook", the background we see through the rear window shows a curve, but Carol's hands on the steering wheel never move. (00:03:25)
Visible crew/equipment: At "Operation Sky Hook" Dr. Marvin listens back to the tape recording that he was making as the UFO flew over their car and if you look closely the spool of tape on the recorder is at the halfway spot. Earlier as he was making the recording the spool of tape was at the end. (00:05:15 - 00:07:45)
Deliberate mistake: As the Marvin's approach "Operation Sky Hook" they hear the UFO above. Out the rear view window we can see the same sign and background they passed several minutes ago when the doctor started making his tape recording. (00:05:15)
Continuity mistake: The UFO flies over the Marvin's car as they approach "Operation Sky Hook", and Dr. Marvin tells Carol to pull over. She immediately turns the steering wheel to the left but in the next shot she's steering straight ahead. (00:05:30)
Continuity mistake: The Marvin's pull over to the side of the road to look at the UFO and the upholstery of their car changes from black to white between shots. (00:05:30)
Continuity mistake: The UFO flies over the Marvin's car as they approach "Operation Sky Hook" and causes them to pull over to the side of the road. When the doctor gets out of the car they're in a different place than they were in the previous shot. (00:05:35)
Continuity mistake: After they pull over to the side of the road to look at the UFO, Dr. Marvin gets back into the drivers side of the car as Carol slides unobstructed from the drivers side over to the passenger seat. In the next shot the tape recorder is sitting there between them. (00:05:55)
Continuity mistake: After they pull over to the side of the road to look at the UFO Dr. Marvin gets back into the drivers side of the car and his jacket is draped over the center of the front seat. In the next shot it disappears. (00:06:00)
Continuity mistake: After they pull over to the side of the road and look at the UFO, Dr. Marvin gets back into the drivers seat and hands Carol a Chesterfield from his shirt pocket. In the previous shot he didn't have anything in his shirt pocket, in fact he didn't even have a pocket on his shirt. (00:06:00)
Continuity mistake: Carol and Dr. Marvin finally get to "Operation Sky Hook" and they're driving the exact same make and model car as they were in the previous shot. The only thing that has changed is the license number, which was AV-27-X3 and is now AV-35-B7. (00:06:55)
Visible crew/equipment: At "Operation Sky Hook" Dr. Marvin says to Carol, "I want you to transcribe these notes for my report" and you can see the shadow of the camera as it follows them on the left of the screen. (00:07:20 - 00:15:50)
Continuity mistake: As the Marvin's listen to the tape recording of the UFO, Dr. Marvin stops the recorder and uses his finger to re-wind it. If you look closely he goes way past the spot where the sound started. (00:08:00)
Continuity mistake: Gen. Hanley drives up to "Operation Sky Hook" and stops in front of the guard post. At first he's in direct sunlight than in the next shot as he hands his ID to the guard, he's in the shade. (00:08:40)
