Revealing mistake: In a close-up of the hitchhiker putting the bracelet on Prescott's wrist, you can see the bracelet is not locked on.
Audio problem: When Scott and Lady Penelope are communicating with each other via mobile control, the timing on the lip sync between the two characters during the split screen effect is completely out of place.
Audio problem: When Jeff says "Scott, Alan, Tin-Tin" after hearing from the TV Reporter that all hope is fading for Thunderbird 3, the words don't match his lips.
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.
The Perils of Penelope - S1-E3
Continuity mistake: While Parker is driving FAB 1, when Penelope holds up her communications compact for Parker to identify the train attendant, in the shot facing the compact she has a pink sleeve, but Penelope's attire is all blue. (00:30:20)
Visible crew/equipment: After Central Control announces the countdown for Red Arrow project is now operating, when it cuts to the tower the order is given to "begin photographic alert procedure," and in the next shot a human finger (with a long polished fingernail) is visible behind the seated male marionette, as he leans forward. (00:04:45)
Continuity mistake: After Lady Penelope rescues Brains from the psychiatrist's office, when she holds out her communications compact to message Scott it's in her left hand, but in the closeup it's in her right hand and the color of her sleeve also changes. (00:45:50)
The Duchess Assignment - S1-E21
Continuity mistake: After the Duchess has been rescued by "those romantic young men from International Rescue," when the Duchess removes the canvas from her umbrella, in the closeup (with human hands) she's wearing a pink button-down, but in all other shots there are no buttons whatsoever. (00:45:20)
Continuity mistake: After Scott realises that someone has tampered with TB1's camera detector, when it cuts to the movie set's camera, Agent 79's (the Hood) disguise eyeglasses are hanging beside the mask, but in the next shot the eyeglasses have vanished. (00:29:50)
Continuity mistake: When Elliot picks up the radio microphone to call Search Control, the radio headset on his shoulders turns round between shots.
Continuity mistake: When Thunderbird 2 launches Thunderbird 4, the number "4" on the puppet sized pod door in a close-up does not match that in the model scale long shot.
Visible crew/equipment: In a shot of the camera moving through the castle, the shadow of some studio equipment is moving down one of the pillars.
Continuity mistake: When Scott says goodbye to Goldheimer, you can that the cockpit window on Thunderbird 1 has bolts directly around it, but when Thunderbird 1 is pursuing the Hood a little later on, the cockpit window now has a metal border with bolts.
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.
Character mistake: Scott flew to Ireland to look for the missing Fireflash airliner, but when Jeff asks where Scott is, Virgil replies, "His take-off from England was delayed for some reason."
Continuity mistake: When we see The Hood inside Thunderbird 1, the cockpit is placed in its vertical position, as opposed to horizontal when the craft lands.
Other mistake: When Virgil says "That's better" when he and Scott are pushing the reactor rods back in place, his mouth does not move.
The Duchess Assignment - S1-E21
Other mistake: When the WAT Wombat lands on the runway, the jetex attached to the underside can be seen falling off.
Pit of Peril - S1-E2
Other mistake: When the atomic reactor goes down 20 points in the Sidewinder, look at Frank and you can see his left eyebrow is missing.
