The actors had tremendous trouble acting oposite the Moloch puppet, because they kept laughing, unable to take the thing seriously. This was solved by having them deliver their lines off-camera.
On a TV nostalgia show, Paul Darrow particularly singled out Moloch as one of the more disappointing realisations on the series' budget.
Vere Lorrimer took it upon himself to write a song that was sung by convicts from the planet Kalkos - "The Convicts' Freedom March".
The metal plating that makes up much of the interior or the T-16 Troop Transport ship was previously used in the Vogon ship from The Hitchhiker's Guide to the Galaxy (1981), which got this from the set of Alien (1979).