- Costume Backlash: Martin Clunes has made no secret of how much he hated the costumes he had to wear in this serial. Talk show hosts frequently exploit this to mess with him, bringing up clips from the serial to riff on the outfits. This played a big part in the story becoming an Old Shame for Clunes.
- Deleted Scene: The last episode overran, leading to the removal of a scene where the Doctor comforts Tegan about her ordeal. It was used in the next story (although it includes the explanation that the Mara could only be destroyed during the process of its becoming, creating a minor Plot Hole if the serial is watched in isolation).
- Inspiration for the Work: In the DVD extras, Christopher Bailey states that the idea for the serial came from a story or article about isolated Christian sects in the Arizona desert that handled snakes as part of religious rituals. The religious groups he is referring to actually are located in Appalachia, areas such as Tennessee (where it originated), Kentucky and Georgia, not Arizona.
- Old Shame: Martin Clunes is rather embarrassed about his role in this serial, mostly because chat shows have kept bringing clips out from it showing him in the silly costumes.
- Pop Culture Urban Legends: Because Christopher Bailey didn't write much else for TV, and because of the unusual nature of the script, there were widespread fandom rumours that "Christopher Bailey" was a pseudonym for a very well-known highbrow person who didn't want to be openly known as a Who writer, with the most common targets being Tom Stoppard and Kate Bush. This was eventually debunked when Bailey himself appeared in interviews in 2002 and 2011.
- Prop Recycling: According to John Nathan-Turner, the staircase in the Chamber of Lom was used for A Song for Europe.
- What Could Have Been:
- Dugdale was originally called Duchan (a platform used by Hebrew priests).
- Judi Dench, Jean Marsh, Anna Massey, Kate O'Mara, Barbara Shelley and Joan Sims were considered for Tanha. O'Mara would go on to play the Rani, while Marsh, who previously played Joanna in "The Crusade" and one-off companion Sara Kingdom in "The Daleks' Master Plan", would return to play Morgaine in "Battlefield".
- You Look Familiar: Brian Grellis previously played Sheprah and Safran.
Trivia / Doctor Who S20 E2 "Snakedance"