Paul Foster's hair grows a noticeable length on his forehead between the time he talks to Dr. Reed in the command module and then to Jane Carson in the leisure module.
When the Dalotek complex is holed and it depressurises, all the papers blow into the room whereas they would blow out as the pressure outside is far lower.
Approx 22:40 When the Lunar Module is coming in to land at Moonbase the computer display on the module's instrument panel is labeled "Computor Display".
As Straker and Foster speculate about the goal of Dalotek, Straker rules out mineral resources as an interest, as Straker says the moon was mined out of anything valuable "years ago". 1. The first exploratory landings (at time the series was produced) was imminent for circa 1969-1970. Serious mining would not have gotten under way for at least two more years, and would have been tremendously expensive. It would be a decade before major mining could even have begun, and that would put it past 1980, the earliest year of SHADO's operational status. 2. If the moon had been "mined out", it would not look pristine - craters, undisturbed soil, etc. 3. Mining out would take decades, probably centuries and still not get everything of use. A more credible remark by Straker would be to cite the superior economics of mining on Earth.
At about 27:20 while looking at the alien device, a fly flies into the shot.