Just after the explosion, we see Helena, Mathias and the nurses through the observation window. In the next reverse shot, we see just Helena, but then Mathias runs from right to left behind her, towards the door. He should be already on that side. Thanks to Thomas.
Barely visible on screen, Petrov's ID card shows the name "Reeves" (Robert Reeves plays "Peter", a Command Center operative, also seen in this episode).
On Alpha, the stun gun that Cantar takes from the guard has no stun/kill slider. On Golos, it does. Note that when the guard uses the gun, he does not press the button on top. Cantar keeps his thumb on the button.
In Helena's quarters, a filing cabinet is behind the clay head. In the later shot only, the "Visible Man" and "Visible Woman" model figures can be seen on top of the cabinet- they were not there previously.
The guard's body moves towards the wall between when Maya and Tony arrive and when Koenig arrives- not necessarily an error as he may have stirred.
Cantar is ambidextrous. He holds the stun gun with his right hand until Helena scratches him. He then changes to his left hand. Thanks to Thomas.
The stun gun is in a different position on the table in long shot.
When Sandra is overhearing Tony's conversation with Maya at the end, the close up shows her in a different position to the long shot. Thanks to Thomas.
When Maya changes into the old hag, we can briefly see the old woman's hair between Sandra's collar and Tony's arm, as she is standing up to replace Catherine Schell behind Tony. Thanks to Thomas.
Space 1999 Copyright Granada.