When the Lunar Module begins reentry, in space, look at the back of the underside, and you can see a limpet UFO on it, showing this is stock footage from Conflict that hasn't been checked properly.

There are a LOT of editing errors in this series! You'll find at least one in nearly every episode. They really should have fired their editor and hired a new one!

The commentary for the DVD explains that the director was young and somewhat inexperienced. Maybe, that accounts for some of the errors.

They seemed to use up their air supply pretty fast, for being stranded less than 8 hours.

Yet another editing error. When the pilots go down to the interceptors in the opening scenes, Mark isn't among them (they're all white). Yet we see Mark is leading the interceptor flight.

When Mark finds that its the spacesuit from the rec area that is missing he states that the air supply hasn't been recharged, so Craig won't have much time before he blacks out. Given the size of the shoulder pack there can't be much of an air supply in there in the first place. And given how much even a relatively small space suit oxygen tank must weigh it must be very uncomfortable to have all its weight on one shoulder like that.

When Straker fakes trying to kill Foster at the end he uses an "old fashioned" pistol instead of a "modern" SHADO pistol. It would be interesting to know why. Perhaps the SHADO pistol prop had some flaw that made it unusable for the scene.

Just like the clothing the UFO crew missed the mark as far as firearms design went. The firearms used by military units in 1980 in the real world were largely the same ones that such units were using in 1969 when UFO was made. Another case of using "futuristic" looking props for no other reason than they looked futuristic.

Straker sure puts a lot of faith in both Foster and Jackson's diagnosis at the end. Foster is left alone in a room full of weapons unwatched for at least several minutes, during which time he could have taken them and tried to kill Straker again, and for that matter tried to destroy SHADO HQ if Jackson is wrong.

Straker smokes on Moonbase, which seems rather questionable.

Straker's pyjama outfit is nearly identical to the pyjamas that would later turn up on Space: 1999, including being a similar shade of blue. This would seem to indicate that both were designed by the same person, presumably Sylvia Anderson, and that the Moonbase Alpha version wasn't designed by Rudi Gernreich like the Moonbase Alpha uniform.

When the one guy attacked Straker in bed, part of me wanted to see the hypodermic needle puncture that air mattress.

Security needs better training. One more second to check those tubes & they could have found the guy.

Emergency doors remained unlocked even during a lockdown?
What part of lockdown do they not understand? At the very least they should have had guards on those doors.

So for double the budget SHADO could build 4 moonbases?
Well, looking at how easily a single bullet punctured the structure they really are going with the lowest bidder. ("Trust me! It's the strongest reinforced cardboard you'll find anywhere!")

Straker's gun fires 11 bullets. I'm not sure if that's a nit for that type of gun or not.

This might be the only time we hear alien voices-- the ones crying out 'Kill Straker!' that brainwash Paul and Craig.

The lunar module is in Earth's atmosphere and bounces off, so they fly all the way back to the Moon because 'they had just enough fuel' to do so? They were home-- why go back to the Moon?

During re-entry Foster and Craig really needed airmasks, like real pilots do. They could have suffocated and blacked out, and then they really would have died.

Splashing coffee on a single control panel shorts out all of the panels and main lights of the entire Monnbase???
I think those systems must have been designed by Irwin Allen!

Foster's first missed gunshot pierces the bulkhead of the control room of Moonbase and air begins to escape. However, Foster fires TWO more shots at Straker, and the bullets magically somehow don't pierce anything. Now, the second shot is basically waist level, so it could have hit a control desk, and the third was pointed downward, so that would have had to travel further down to eventually exit the base, but those two shots are just ignored. They don't even cause an electrical failure like the splashed coffee.