- When Scott tells Virgil that the Mole has reaches the drilling point, he has two blue tubes in the holsters on his belt, rather than one blue and one yellow. He had the correct arrangement at other points in the episode.
- When Scott and Virgil are testing the gas and Scott passes out, the close up shows him falling forward, but then the far out shot shows that he has actually fallen backwards.
Scott passes out, falling forward.
Scott lying on his back.
- When Joe Carter parks the car in the car park, there are several cars to the left of him. In the close-up shot of the car, several cars have disappeared.
- When the Woman Driver's car crashes, in the long-shot model shot, she and her husband are thrown out of the car, still in their seats and the fire breaks out at the rear of the car next to the one they crashed into. But in the close-up puppet shot, the Woman Driver and her husband are back in the car and the fire is to the rear of THEIR car.
- When the Woman Driver's car crashes, it stops with its front end atop the car next to the one it crashed into. But just before the car explodes, it is flat out on the ground.
- In the Thompson Tower at one point, Blanche and Tommy are sitting on a bench whilst Joe Carter keeps hitting the steel door. When the Tower Control Assistant switches on the television he says "How did they get in there?" and we see a picture of the family. This time, it's a different picture to the one seen before as Blanche and Tommy are not sitting on a bench, and Joe is nowhere near a steel door.
- Before John radios base, Jeff can be seen reading a magazine with his feet on his desk, but two shots later he is sitting up straight with his feet under the desk.
- When The Thompson Tower collapses and all Fire Trucks evacuate the area, the police cars are missing.
Police car with the Fire truck.
- Just before the Fire Tender disappears, small flames can be seen at the Fire Tenders rear. This was most likely an accident that occurred during filming.
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Fire tender on fire.
- Although the Thompson Tower is clearly situated in the United States, a sign on the wall of the Control Centre uses the British spelling of 'Centre' instead of the American 'Center'.
- When the Thompson Tower Controller asks "Are those fire tenders coming?", he is voiced by Ray Barrett.
- When the Tower Controller says "I've got a fast car ready for you outside." his lips don't move.
Tower Controller.
- When Virgil says "Yes." before Scott reminds him how white hot the fire will be, his voice is not filtered to sound as though it is coming through over the radio.
- As Scott and Virgil tunnel into the corridors and start to cut through the first door, Blanche is unconscious along with Tommy. But just before Scott and Virgil reach the second door, she is conscious again, and just before Scott kicks the second door in, she has once more passed out.