This was the last story of Whoniverse to be directed by a woman until Blink (2007) over 20 years later.
Colin Baker inadvertently got dog excrement on his face filming the scene where the Doctor rubs dirt on his face so he resembles a miner. The dog had come across the assigned pile of dirt and thought it a good place for relief.
The first appearance of The Rani.
Nicola Bryant injured her neck while sleeping. As a result, she would have to wear a brace for the remainder of the shoot - except while the cameras were actually rolling - and was in some discomfort.