Continuity mistake: Throughout series 2, the five pictures of Jeff Tracy's sons on the wall at Tracy Island are completely different to the ones seen in the first series. But when Scott prepares to launch Thunderbird 1, you can see the picture of John is the one seen in series 1.
Thunderbirds (1964)
1 mistake in Season 2 generally
Starring: David Graham, Ray Barrett, Peter Dyneley, Shane Rimmer
Trivia: The shot of Thunderbird 2 flying in the dark is actually reused footage from a previous episode, "The Man from MI5."