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)????
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)????
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. (00:10:20)????