In the first panel of the story, two previously unseen types of futuristic Earth vehicles are seen: a hover fuel tanker and a tank.

This story reveals that a newly-built international space base is located on the Atlantic coast of Cornwall. Cornwall is a county located on the southwest peninsula of England.

Colonel Foster is erroneously referred to as Major in this story.

In panel 10 of page 1 of the story, the SHADO transport carrying Freeman and the other men appears to fly over Stonehenge. This would make some sense, as Stonehenge lies along the path from Harlington, where SHADO HQ is located, to Cornwall.

On page 2 of the story, the security escort for the tanker reports they've been attacked on the Coast Road. This is an actual road in Berrow, Somerset, UK, on the way to Cornwall. The officer also refers to it as the Riddisford road; I've been unable to confirm this as an alternate or related name to the Coast Road.

How did the UFO get the tanker through the fence of the abandoned chemical plant? In the last panel of page 2, the UFO appears to be blasting a hole in the fence for the tanker. But, on page 3, when SHADO forces arrive, the fence is completely intact and they wonder how the tanker got inside. Do the aliens have some kind of technology that renders solid objects immaterial long enough for another object to pass through?

Straker's theory about why the aliens are so anxious to get their hands on the 12X chemical, just because it happens to be green like the fluid used in the alien spacesuits, is rather flimsy...though he seemingly turns out to be right.

Page 4 reveals that all SHADO Mobiles now carry a bogus alien spacesuit in case one of the occupants needs to masquerade as an alien on a mission. This decision may have been reached after the success of past masquerades with spacesuits, e.g. "Trojan Horse".