Attack of the Alligators - S1-E23
Continuity mistake: During the after-mission chat, Alan is wearing a bandage above his left eye due to an injury he picked up on duty. If you look carefully this bandage sometimes changes between shots; it is particularly noticeable when he's in the bathroom with Tin-Tin. Also, the bandage is too small and too high up to have covered the injury adequately. (00:45:25)
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: As Fireflash makes its first landing attempt onto the elevator cars, the radio control elevator car on the left can be seen to bear the number 4, even before car 3 had crashed and car 4 had left the pod.
Continuity mistake: As Thunderbird 1 crashes in the desert, Scott is thrown forward and he bangs his chin on TB1's flight controls. But after TB1 has crashed, Scott is shown with his forehead on the controls.
Other mistake: As Virgil prepares to clear the wreckage of the tower from the rescue area using the Firefly, Scott tells him that he will go over to Thunderbird 2 to prepare the Mole for tunneling. The Tower Controller then says to Scott, "I've got a fast car ready for you outside" without moving his lips.
Other mistake: At the end of the episode in the space rocket Scott says "you can say that again" without moving his lips.
Factual error: Although the Thompson Tower is 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'.
Pit of Peril - S1-E2
Continuity mistake: Although the Sidewinder fell on its back, the crew is always seen standing the right way in the control room.
Continuity mistake: The broken section of monorail track that is attached to the top of the centre coach when Thunderbird 2 lifts it away from the bridge is significantly longer when Virgil sets the coach down on the mountainside.
Factual error: On the night of the Hudson Building fire, the Auto Date Fixer in Commissioner Garfield's office reads 12/7/65. The next day, it reads 13/7/65, illustrating attention to detail on the part of the set decorator. Unfortunately, this overlooks the American convention for the month numeral to appear first. In the US the convention is month/day/year, in the UK the convention is day/month/year. So, either the first date should read 7/12/65 (July 12th) with the next day as 7/13/65, or the second date should read 12/8/65 (December 8th).
Continuity mistake: When Alan, Tin-Tin and Scott are lowered while on the settee to enter Thunderbird 3, looking head-on at them we have the three of them sat in that order from left to right as they descend the shaft. However, when it cuts to the long shot, Alan and Scott have magically swapped places. When they are fully raised into Thunderbird 3, Alan and Scott are back in their original positions on the settee. (00:18:50)
Plot hole: The Mighty Atom is only supposed to take pictures of human faces yet we see it taking photos of the machinery in the Saharan Plant when no one is in the room.
Plot hole: When Jeff Tracy contacts Lady Penelope, it is 10:00am in England, yet it is already daylight on Tracy Island in the South Pacific and Alan, Gordon and Tin-Tin have been out fishing for some time. (It is later established in the 1966 "spin off" movie "Thunderbirds Are Go" that there is a five hour time difference between Tracy Island and England. So, using that as a guide, when it's 10am in England, it should be 5am on Tracey Island.)
Move - And You're Dead - S1-E20
Deliberate mistake: Throughout Thunderbirds, when the script required objects to be manipulated, there were cutways to close up 'insert' shots of real human hands - usually of the puppeteers/crew. However in this episode, Alan's close-up (i.e. live action) hand is remarkably hairy with very dark hair. Yet Alan Tracey is supposed to be 21 and blond haired (including the hair on the back of his hands).
Other mistake: Just as the villains' car goes out of control in the opening sequence, a huge lump of greenery falls out of the sky in the background.
Plot hole: Crablogger designer Jim Lucas lives at 75 Sunnigale Road, Eppington Wood East, Somerset, according to the card that Penelope finds in the personnel files at Robotics International, but she reads it out to Parker as "20 Hazlemere Gardens, Iresham."
Other mistake: When Lady Penelope is counting her sheep, Parker had just told Jeff that she has 200,007 sheep. When we see her using the sheep-counter machine its display only has five digits instead of the necessary six. (00:14:35)
The Perils of Penelope - S1-E3
Continuity mistake: As it bears down on Penelope's perilous position, the leading car on the Anderbad Express monotrain keeps changing colour, from white and red to silver and blue.
Terror in New York City - S1-E4
Deliberate mistake: As Thunderbird 4 is shaken by the shockwave from the collapse of the Fulmer Finance building, water can be seen running down the outside of the aquarium positioned in front of the model set.
Deliberate mistake: When Selsden and Malloy try to open Penelope's safe, the bulb in Malloy's torch gets so hot that the prop torch begins to smoulder.
