During one of the establishing shots of the villa at night, a slowly revolving band of light appears on screen. This comes from a "phantasmagoria", a device which displayed pictures by sending light through holes cut in a ring of metal. The book that Shelley and co. read which inspired her to write Frankenstein (and lead to the events in the movie) was also called Phantasmagoria.
After Shelly comes down from the roof and tells of his fascination with lightning, Byron calls him "Shelly, The Modern Prometheus." When it was first published in 1818, Mary Shelly's novel was called "Frankenstein; or, The Modern Prometheus."
Other works of literature mentioned in the film are "The Castle of Otranto" by Horace Walpole (regarded as the first Gothic novel), "Vathek" by William Beckford and the poem "The Grey MonK" by William Blake.