- Production on this film began after 'Anderson, Gerry' began work on "Captain Scarlet and the Mysterons", a series that used far more realistic-looking Supermarionation puppets. Anderson reportedly considered making Thunderbird Six in the same style, but decided for reasons of continuity to return to the "big-head" style of puppets for the film. Apparently, some of the new style puppets are visible in some scenes.
- The puppet of Cliff Richard Jr. (used in the film Thunderbirds Are GO (1966) makes a cameo appearance, disguised with thick-rimmed glasses and a moustache, sitting behind Lady Penelope at the Whistle Stop Inn.
- Joan Hughes (pilot of the Tiger Moth) was charged but later acquitted of seven counts of dangerous flying when the Tiger Moth failed to make contact with the surface of the M40 motorway (which was still under construction at the time) while passing under a bridge (a crosswind had prevented Hughes from landing the plane on the road before passing under the bridge as it was supposed to). 'Norman Foster' (who supervised the shooting of this scene) was also charged but acquitted of three counts of aiding and abetting.
- During the evacuation of the missile base, one of the cars driving through shot is Sam Loover's car from Joe 90. Footage of the destruction of the missile base also appears in the opening episode of Joe 90.
- The International Rescue passengers on Sky Ship One overfly and visit numerous locations previously visited by IR in the TV series - they overfly the Atlantic Ocean (Operation Crash-Dive and Atlantic Inferno); have breakfast over the now-Empire State-less New York City (Terror In NYC); fly over the Grand Canyon (Brink Of Disaster); hunt in Africa (Pit Of Peril, complete with a few music cues from the episode); visit Egypt (Desperate Intruder and The Uninvited); and have dinner at a hotel in the Swiss Alps (The Cham-Cham).
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