For timing reasons, this episode's cliffhanger was edited. This would have seen the Doctor falling down a shaft when a Drashig comes upon him in the Scope interior. In the episode four reprise, the Drashig plummets after him and the Doctor is seen to have been saved by catching his foot in a rope. As broadcast, this sequence was skipped over altogether, and the Doctor's emergence from the Miniscope - originally to have occurred during episode four - was brought forward to serve as the cliffhanger instead.
The Drashigs' roar is made from a reversed and slightly slowed down sound effect of a screeching car.
This episode was watched by 9 million viewers on its original transmission.