The episode was originally intended to come later in the season, after Pressure Point (1979). As a result of the change, Gan had to be added to the script, resulting in him spending a large part of the episode unconscious.
Blake's original line upon being rescued by Avon was, "Can't you tell your frineds from your enemies any more?" Gareth Thomas changed it to "Missed".
This was the episode with the lowest ratings on original UK transmission.
Blake apparently met Ro's friend Porah during the events of Space Fall (1978), although this was not seen at the time.