Able Lincoln was assassinated in 1865. the first edition of
Dracula would not be released until 1897. so we can say for sure he did not know about Dracula. but it is likely he knew about vampires, as they had been popular in fiction & legend for centuries, and Lincoln was an avid life-long reader. he belonged to no church, preferring to believe in his own personal idea of God, so he comes across as somewhat of a free thinker. he was self-taught. it's not a leap to say he was familiar with supernatural fiction, like many other Americans of the 19th century. Spiritualism (seances, Ouija boards, poltergeists, etc.) was a big cultural movement that began in the 1840s (
https://en.wikipedia.org/wiki/Spiritualism#Origins). popular interest in the supernatural, non-traditional religions, and folk beings was at an all-time high, helped no doubt by the publishing of all kinds of books on the matter.
Einstein knew about Newton. a great deal of what Einstein brought to science had major implications for the classical physics that were popularized by Newton. Newton helped lay the foundations for classical mechanics. Einstein sort of smashed that with a hammer, introducing the atomic age, the weirdness of quantum dynamics, etc. he started his career by reacting to Newtonian physics, coming up with E=MC^2. Newton is essential to the Einstein story. he is like Einstein's familiar.
the real question is DO YOU know about Isaac Newton. he's a fascinating motherfucker. he wrote books on light and sound, he studied alchemy and biblical chronology. his religious views, considered heretical by some at the time, were quite in line with the intellectuals of the late medieval & early Renaissance. the practical inquisition into all facets of life, the search for all knowledge, the Philosopher's Stone, kabbalah, astrology, and magic were all parts of this free line of inquiry that predated what we now know as "science".