Revealing mistake: When the dummy plane is shot out of the sky by the fighter pilot, a piece of the plane shoots off into the top left of the screen and bounces off the sky background. (00:23:05)
Continuity mistake: Near the end of the episode, Jeff activates Operation Cover-Up to change the wall-mounted pictures of the International Rescue members from the usual pictures of them in their uniforms to ones of them in casual clothing before a doctor who has just examined Kyrano enters the room. However, while he and Jeff are talking, a couple of shots of Scott and Gordon contain enough of the pictures to show that they have reverted back the ones of them in uniform. (00:48:35)
Continuity mistake: When the Hood is taking photographs of Thunderbird 1 at London Airport, one of the photos shows the letter "T" of Thunderbird painted on the red nose cone. All other shots of the craft show the nose cone free of markings.
Continuity mistake: When the Hood is taking photographs inside Thunderbird 1, we see a close-up of his hat. On the hat, it says "Airport Police" on the lens, but when we see a full view of the Hood, the words are no longer visible.
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.
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.
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.
Revealing mistake: When we see the passengers in the departure lounge at London Airport, one of them is reading a newspaper. If you look carefully, the front page is on the wrong side; it is on the left instead of the right.
Continuity mistake: When Bob Meddings boards the Fireflash and grabs hold of the pipe, the pipe is red both in a long-shot and a shot of him grabbing hold of it. When we see Meddings moving his hands along the pipe, it is now silver.
Continuity mistake: When we see the Hood's Airport Police jacket, you can see that underneath "Airport Police" there is a five-pointed star, but when we see a close-up of the star in the next shot, it has changed to a six-pointed star.
Continuity mistake: When the Hood informs Commander Norman of Air Traffic Control that there is a bomb on Fireflash in the videophone booth, you can see that the Hood has one hand on the button panel, but the next shot shows him with both hands on the panel.
Continuity mistake: When Jeff is speaking to Kyrano at the beginning of the episode, he has a letter in his right hand and an envelope in his left, but when Jeff raises his left hand in the next shot, the envelope has disappeared.
Character mistake: When Gordon and Scott are playing chess at Tracy Island towards the end of the episode, the chess board is oriented incorrectly, as there is a white square in the bottom-left corner.
Continuity mistake: When Jeff pushes the button next to his seat to do "Operation Cover Up" at the end of the episode, there's a closeup of his hand as he leans over to press the button while he is sitting down, but in the next shot he is suddenly standing up near the portraits of his sons.
