The UNSC headquarters on Earth shown near the beginning of the film is called "Lowry Field" in the foreground subtitle. In real life "Lowry Field" was located in Denver, Colorado and was better known as Lowry Air Force Base. Science fiction author Robert A. Heinlein also used Lowry Field as a rocket base in his novel "The Man Who Sold the Moon," which may be where the script writer for The Green Slime got the idea. In real life, Lowry Field/Air Force Base was an airfield, a base for ICBMs and a military and naval intelligence analysis center. Lowry AFB was mostly closed beginning in the late 1990s (except for a DFAS building serving veterans and service people at Buckley AFB) and has since almost entirely become a "planned community" featuring mostly upscale single family homes and condominiums.
Dr. Hans Halvorsen:
The blood cells of these creatures act like seeds - they can spawn new creatures from its own blood!
Although the asteroid Flora appears not to have an atmosphere, both billowing rocket smoke and liquid water are present, indicating air pressure. However, smoke shouldn't billow as shown in the movie when the rockets are used in the airless vacuum space.
Although "The Green Slime" was released in the U.S. as a 90 minute version, director Kinji Fukasaku and his editor prepared a much more tightly edited 77 minute version (called "Gamma III: Big Military Space Operation") for release in Japan. This "Japanese" version eliminates the Robert Horton/Richard Jaeckel/Luciana Paluzzi relationship triangle, and is much more "militaristic" in tone. Several scenes are edited differently, additional alternate music cues are used (which are less "sci-fi" sounding than the "Amercian" version), and the rock and roll theme song is omitted entirely (replaced by a military march theme). The ending before the credit roll has additional scenes inserted with Paluzzi and Jaeckel, which change the tone of the ending from optimistic to downbeat.
English, Japanese