Audio problem: At the start of the episode, Colonel Benson is voiced by David Graham. But when he appears on TV, asking for International Rescue's help, he is voiced by Ray Barrett.
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.
The Duchess Assignment - S1-E21
Audio problem: In the opening scene at the casino, the rogue croupier at the Duchess' table is voiced by Matt Zimmerman, but when the same croupier calls out "18 red", he has a completely different voice provided by Peter Dyneley.
Audio problem: When the second reporter says to the first reporter, "Panic's over then. Did you hear the cloud got blown away?", it is said by David Graham instead of Matt Zimmerman.
Terror in New York City - S1-E4
Continuity mistake: At the beginning of his journey on the Sentinel to the rescue site, Gordon has the beginnings of a beard on his face, but in subsequent shots he is completely clean-shaven.
Continuity mistake: When Scott and Virgil are performing the rescue operation, watch the position of Blanche Carter. When we see her she is sitting down unconscious near the bench where Tommy is lying, but just a few shots later she is standing up next to Joe, and then later she is sitting down unconscious again.
Continuity mistake: When the red car crashes into the yellow car in the car park and starts a fire, both of the puppets are thrown out of the vehicle, but in the next shot they are suddenly back in the car.
Pit of Peril - S1-E2
Continuity mistake: During the launch sequence of Thunderbird 2, Virgil is sitting in his seat with the steering wheel in front of him the correct way, but when Brains comes down in the lift, the steering wheel is upside down.
Terror in New York City - S1-E4
Revealing mistake: In the scene when we the Fulmer Finance building starting to collapse, a wire can be seen attached to the top of the building.
Terror in New York City - S1-E4
Continuity mistake: In its first appearance when it attacks Thunderbird 2, the Sentinel is rapidly moving at all times. But when we see the missiles being prepared for fire, the craft is holding still. You can tell this as the clouds in the sky are not moving.
Pit of Peril - S1-E2
Continuity mistake: When we see a model of the US Army helicopter and the four crew members outside it, you can see there is no-one inside the helicopter, but when we see the crew members talking outside the helicopter, a man has suddenly appeared.
Continuity mistake: At the beginning of the episode, we see Thunderbird 1 and there is only one "TB1" logo on the rocket. But when the Zombites craft start attacking Thunderbird 1, there are two "TB1" logos.
Continuity mistake: The characters all refer to Williams's station as Dunsley Tracker, but in a close-up of the console, the caption above the alert light reads 'Densley Tracker'.
Continuity mistake: Before going on board Thunderbird 3, Alan is wearing a brown suit and Scott is wearing a yellow suit and orange shirt. But when Alan goes up the elevator in Thunderbird 3, his clothes have changed to a green checked shirt and beige trousers, and when Scott returns to Tracy Island, his clothes have changed to a blue roll-neck and checked jacket.
Attack of the Alligators - S1-E23
Continuity mistake: When Jeff and Virgil are talking about how to deal with the alligator situation at the house, Jeff says that Pod 6 would be the best choice. Yet when Thunderbird 2 arrives at the scene, it is not Pod 6 that has been chosen - it is Pod 4.
Continuity mistake: Alan and Scott launched Thunderbird 3 to go to Thunderbird 5 and relieve John from his duties in the space station. You can see John leaving Thunderbird 5 to go with Scott to Thunderbird 3, but when Scott returns to Tracy Island, John is nowhere to be seen.
Revealing mistake: The symbols on the walls of the Zombites' control room are the reverse of the symbol on their helmets.
Character mistake: Tim Casey is a Colonel, but Scott refers to him as a General in one scene.
Continuity mistake: When Thunderbird 2 is inside the hangar, it unloads Pod 1, but the numeral on the puppet-sized pod door in the close-up shots doesn't match the one on the model pod seen in long-shot.
Continuity mistake: When Thunderbird 1 arrives at the danger zone, there are no markings down the length of the vehicle when it lands, but lettering appears after Scott calls for help with his equipment. This lettering is in a completely different font to that seen on the vehicle during the launch sequence.
