The members of the Golden Dawn in the show are based on real-life members of the Hermetic Order of the Golden Dawn, a Victorian secret society dedicated to the study of the occult of which Sir Arthur Conan Doyle was part.
Other analogues are:
- R.P. Breakwater: A.E. Waite/W.B. Yeats
- Patricia Colman Jones: Pamela Colman Smith/Florence Farr
- Alan Crawley: Aleister Crowley
- Dion Cross: Dion Fortune
- Gustav Felkin: Dr. Robert Felkin/Gustav Meyrink
Ipsissimus (feminine ipsissima, neuter ipsissimum) means "the highest mode of attainment" and "essentially the superlative of 'self'".
(At 13:39) Hollywood cliché: electricity is noisy.