Heroes and Demons

Robert Picardo (The Doctor) once jokingly described this adventure as "Alice in Wonderland with a bald, middle-aged, cranky, arrogant Alice."

When the doctor walks with Freya in the forest, she shows him a powerful plant. The doctor, who has encyclopedic knowledge, identifies the plant as a fungus called Amanita Muscaria and says it is poisonous. If the writers had chosen any other mushroom, this would be an obscure goof noticed only by mycologists or other mycophiles, but the Amanita Muscaria is the most readily and broadly identified mushroom in the world - the big red one with the white dots. What is shown is a handful of white flimsy mushrooms, perhaps the edible oyster mushrooms or white chantrelles.