The UFO has an escape capsule, this is the only time that this is seen in the series.
At 21:24 Straker's son is lying in a hospital bed. Strangely the medical staff have not cleaned the wound on his right temple, nor have they applied a bandage.
Sole appearance of Andrea Allan as a character other than Moonbase Operative Carol Miller. In this appearance, she played a nurse.
First appearance, in broadcast order, of the Sky One pilot in a wetsuit. Apparently he is the only one who ever leaves SkyDiver.
The car Straker is driving at the film studio is from the Gerry Anderson series The Secret Service (1969).