The shot used in this story of the town of Castrovalva sitting on a cliffside, and the name of the settlement, was inspired by a print by M.C. Escher. Later in the serial, the collapsing world of Castrovalva takes on a distorted appearance, reminiscent of Escher's surrealist work.
Nyssa's costume gradually transforms into the standard outfit she would wear for the rest of the season: first, she exchanges her "fairy skirt" for a pair of trousers when she falls into a brook while attempting to catch the runaway wheelchair before she and Tegan begin carrying the Zero Cabinet to Castrovalva; along the way, she abandons her velvet jacket, and finally she loses her ornamental hair-comb when it gets caught by a tree branch. By the time she and Tegan reach the base of the cliff, she is more-or-less outfitted as she would be for the remainder of the season. This was mainly done behind the scenes to make her outfit more practical for regular filming.