- The material added to the planetarium sequence for the British version includes a serious discussion of several American UFO incidents such as the Mantell case. Several UFO models, based on American UFO sightings, are also displayed and discussed.
- When released cinematically in 1953, there where two versions: one American and one European. In the American version Jimmy Hunt wakes up at the end, having dreamt it all. Then he hears a flying saucer land. In the slightly longer European version, the storyline is retained and the "nightmare/waking up-sequence" is cut. This version also adds a section in an observatory.
- Because of pressures from UK censors the original ending of the American version was altered: it was believed that ending was too depressing and a more upbeat coda was appropriate. The British distributor recalled the cast and filmed new sections (with a dramatically older juvenile lead) to serve this purpose. This is the version referred to in a previous "alternate version" post. When Wade Williams obtained rights to "Invaders From Mars" he discovered that the original negative had been cut. For home video release, he constituted a "third" version of the film that contained some of the material from the UK version cut into the original American release, but retained the American ending (the "dream turns into reality" ending).
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