Anachronisms: The Nasa technicians use the Nasa red "worm" logo. This is no longer used by the agency, and has been replaced at Nasa by the original "meatball" logo.
Continuity: When Carol faints after hitting her car, her hair changes during the sequence.
Continuity: Carol is interrupted before she can break the chain on the machine shop door. When she leaves the room, however, the chain is no longer holding the door shut.
Continuity: When Carol rushes into the house after contamination, she has black stockings on her, but when she enters the bathroom and gets undressed, the stockings are white.
Continuity: In the background where Oliver and his friends encounter an agitated dog and the the owner who is apologizing for the dog’s odd behavior, a boy dress in a Superman costume, a girl dress as Dorothy from The Wizard of Oz, and an adult dress as a clown, can be seen already in the process of crossing the street and passing off screen to the right. As Oliver and his friends were leaving the house, the same people in the background are shown further back than before and just beginning to cross the street.
Errors in geography: When Carol and Oliver are in Baltimore trying to evade the aliens, a Wilshire Blvd (Los Angeles, CA) sign is clearly visible at the top of the frame.
Continuity: When Carol and Oliver crashes in Ben's Jaguar and Carol faints, the car must be in drive, but when Carol gains consciousness she shifts from park to drive and drives off.
Revealing mistakes: When Carol and Oliver enter the elevator, she hits the button for the 29th floor. This causes the button 29 to light up. Yet a wide shot of the elevator interior a few seconds later reveals that neither 29 nor any other floor buttons are lit.
Continuity: When Carol pushes the button in the elevator for floor 29 she gets out of the elevator on floor 35.