Corrected entry: When Lady Penelope says "Hurry, Parker, hurry!" in the speeding cable car towards the end of the episode, her lips do not move.
Corrected entry: It is said Fireflash is cruising at 250,000 feet. But Earth's atmosphere only heightens to 400km. Their were clouds at the the cruising altitude. Clouds only occur around the Troposhpere and maybe in the Stratosphere.
Correction: 250,000 Feet is only 76.2 kilometres so still plenty of room in your 400km.
Corrected entry: Lady Penelope's driving in this episode - as she evades the crooks in the opening scenes - is very proficient and in complete contrast to the atrocious driving that she exhibited in the earlier episode 'Vault of Death'. Perhaps she has had some driving lessons in the meantime?
Correction: Perhaps she has, prompted by the very incident you refer to. Hardly seems unreasonable that she might wish to improve her skills after her abysmal performance in the earlier episode.
Correction: It is Tin-Tin who says "Hurry, Parker, hurry!", not Lady Penelope, and her (Tin-Tin's) lips DO move.