Continuity mistake: When Virgil radios to Jeff that he is about to land on Mount Arkon, Jeff asks him what the weather's like, to which Virgil replies: "Pretty stormy, Father. Pretty stormy." Then we cut to an exterior of the airborne Thunderbird 2, which is absolutely covered in snow. Just moments later we get a long shot and suddenly Thunderbird 2 is no longer covered in snow. We then get a close-up of the cockpit view, where we see Virgil and Brains, and Thunderbird 2 is covered in snow again. We soon get another couple of shots where it alternates between Thunderbird 2 not snow-covered and then being covered in snow again. (00:28:00)
Continuity mistake: When Thunderbird 2 leaves the hangar on Tracy Island, it appears that Pod 3 has been selected (Pod 2 is visible to the right of Thunderbird 2), yet when Virgil and Brains arrive at Mount Arkan, the Transmitter Truck emerges from Pod 6. (The same continuity error also occurs in the episodes 'Vault of Death', 'Move - And You're Dead', 'Martian Invasion', 'The Perils of Penelope' and 'Day of Disaster', probably due to the same footage being re-used for those episodes).
Continuity mistake: When we see Tin-Tin passed out on the table when Thunderbird 3 is on a collision course with the Sun, the style of writing of the "Safety Beam" and "On" and "Off" on the control panel change between shots.
Continuity mistake: When we see a shot of Thunderbird 3 in space on its way to saving the Sun Probe, the "Thunderbird" logo on its side is missing. It reappears later on in the episode.
Continuity mistake: When Alan goes down in the elevator to turn off the safety beam, there is very little sweat on his face, but after a quick cut of his blurred vision, we cut back to Alan, and there is more sweat on his face than there was in the previous shot.
Continuity mistake: While Gordon Tracey searches for the crashed Fireflash wreckage on the seabed, the parting in his hair keeps changing sides from shot to shot.
Continuity mistake: When Scott arrives in Ireland in Thunderbird 1, he starts to land with the landing gear down and you can see wheels on the legs, but when Thunderbird 1 touches down, the wheels have changed to skis.
Continuity mistake: As the second Fireflash crashes, its left wheel housing pod can be seen to be split in two, yet on Fireflash's ascent to the seabed, the pod is intact.
Continuity mistake: Thunderbird 4's laser cutter is of a different scale and at a different angle in relation to the Fireflash engine pylon in close up and long shots.
Continuity mistake: When Scott, Virgil and Gordon are playing snooker at Tracy Island, the balls on the snooker table change position between shots.
Continuity mistake: When Gordon returns to Thunderbird 4 after making contact with the trapped crew, the configuration of the puppet-sized Thunderbird 4 doesn't match the model seen in long-shot.
Continuity mistake: When Gordon is climbing up Fireflash to the cockpit, we see him just about to put the left rubber suckers onto the glass. However, in the close up shot, he is putting it onto the blue metal of the craft.
Continuity mistake: When Virgil is seating at the cockpit during the launch sequence of Thunderbird 2, he is wearing the clothes he wears on Tracy Island and his International Rescue costume appears. But when Alan comes down the lift, Virgil has suddenly changed into his IR costume.
Continuity mistake: When Thunderbird 2 lands on the London Heliport, the sky has suddenly changed from daylight to nighttime.
Continuity mistake: When we see a close-up of Light-Fingered Fred in the prison cell, the games of noughts & crosses on the wall behind him are completely different to the ones seen in previous shots.
Continuity mistake: When Parker is sitting at the table waiting for his meal prepared by Lil, you can see that his knife is pointing to the left, but when Lil says "Now listen here, Nosey!" we cut back to Parker, and the knife is now facing straight.
Continuity mistake: When they are travelling the disused London Underground tunnels, Virgil is on the red hoverbike and Alan is on the blue hoverbike. In the next shot, they have swapped bikes, but when they arrive at the bank they have swapped back again.
Continuity mistake: When Professor Holden is demonstrating The Mighty Atom to the other professors, the position of the device on his hand changes between shots.
Continuity mistake: When we see the Hood destroying The Mighty Atom at the end of the episode, the control box is much closer to the device than it was in the previous shot.
