It would be impossible to instantly identify the exact species of snake which bit a person from just looking at the puncture marks. An expert might be able to tell the marks were from a snake's fangs, but not from what species.
Although set in the village of Bellingham, Northumberland, all of the local characters speak with distinctive Yorkshire, Scottish and London accents.
The new mother is clearly breathing, and has a twitching pulse in her neck, as the Doctor pronounces her dead.
It was stated that Atheris was born without eyelids, but on her death scene, her eyes were clearly closed.
The detective's hands do not move enough to play many different notes on the snake-charmer's flute, especially when he's walking home at night.
Contrary to what the old Colonel says, Fer-de-Lance snakes are excellent tree climbers.