Continuity mistake: In the scene in which Hugh Marlowe and his fiancée are on the alien ship, speaking with the aliens, his arm is over her shoulder when shown from the front, but down and he is about a foot away from her when shown from behind. The shots alternate back and forth, front and behind, so that the mistake is fairly obvious.
Visible crew/equipment: During the final attack after Carol falls on the floor in a hallway in the Pentagon there's a shot of a crowd running towards the camera. The woman in the front has the shadow of the boom mike right on her forehead as she comes close to the camera screaming bloody murder.
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: After the alien ship destroys the bomber, Dr. Marvin picks up the helmet and they all start to run back to the car. In order to save time in repositioning the camera they start out 50 feet behind where they just were in the previous sequence and run back to the exact same spot.
Visible crew/equipment: When seen up close the aliens helmets have no openings. When the alien spaceship takes off outside the Belmont lab one of them is left inside. As he walks out the reflection of the window on the front of his helmet and the person in side can be seen in the sunlight.
Deliberate mistake: After the aliens announce their intentions Dr. Marvin meets with Carol back at their hotel room. He tells her that she must take a flight alone back to Palm Springs and then leaves the room. In the end of the scene she picks up a copy of The Evening Star, which is an obvious prop as it has no date on it.
Plot hole: After being denied permission to contact the aliens by himself, Dr. Marvin returns to his hotel and calls them up on the radio anyway and arranges to meet, despite not being allowed to leave the hotel. His wife says she overheard him say he's under orders not to leave and begs him to call someone instead: "Call Huglin". She shouldn't know who Huglin is because Huglin was only assigned to guard them as Marvin was being denied permission to contact the aliens.
Continuity mistake: At Carol's barbecue a soldier drives up in a jeep with a message for Dr. Marvin stating that they lost contact with rocket No. 11. Dr. Marvin holds the message and an envelope in his hand as they look up and see the rocket burning up in the atmosphere. He never puts the message back into the envelope but when he sits down the envelope is alone and the messages is gone.
Continuity mistake: As the aliens announce their intentions to the people of earth Dr. Marvin walks up to a radio in the back of the lab and says, "If I'm right they'll sail into Washington in broad daylight ". If you look closely the radio is pointing to a different station that it was when we saw it previously in the scene even though no one has gone near it.
Continuity mistake: Dr. Marvin tries out his new improved magnetic interference unit and an alien craft is spotted flying around inside of the Belmont lab above their heads. Before the craft takes a dip down at them they're standing on the right of Dr. Marvin's magnetic device, but when we see them again they're standing on the left of his device.
Continuity mistake: Dr. Marvin walks in as Carol sleeps in their hotel room and then proceeds to call the aliens on his shortwave radio. By the time he walks out of the room to meet with them by the Chesapeake Bay the items on top of his dresser have moved, without anyone going near them.
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.
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.
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.
Continuity mistake: At Operation Sky Hook, Gen. Hanley tries to get Dr. Marvin to stop the launch, but he can't. We see the rocket several times on the doctor's video screen and the rocket that actually blasts of is not the same one we first see, as the tail fans are painted differently.
Factual error: This mistake involves the scene with the "translating computer". This scene was actually filmed at the University of California's Engineering Lab, and the machine (called a differential analyzer) really was in use at that time. A photo of this exact machine can be seen in the November, 1951 issue of 'Radio and Television News' on page 70. Here's the mistake: In front of Dr. Marvin, is an X-Y plotter, used to plot graphs from the machine. When the camera zooms in on it, the camera now shows a pantograph, which is a mechanical device to duplicate drawings or sketches. Out of camera view, a crew member is writing the message, and the 'output' end of the pantograph is then shown doing the 'writing.' That machine (or any computer in the 50's) would be incapable of translating a foreign language, let alone an alien one.
01:00:55 - 01:01:30ira
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.
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.
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.
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