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)
Continuity mistake: During the rescue operation, Thunderbird 2's wreckage grabber changes from being semi-circular with flat edges as TB2 flies over the water to being angular with teeth as it is being dropped down to the rocket.