Most of the allusions are based on the folklore of Yorkshire, England. It was full of stories about ghosts. There are also references to Yorkshire rituals. Edgar's act of sitting up the entire night with Catherine's body after she dies was a traditional ritual in Yorkshire. Also, the ritual of "bidding", which was "an invitation to accompany a body to the grave" was common in Bronte's community. Finally, the many references to tuberculosis were references to the disease that was rampant in an area where the climate was so severe and heating so poor.
In chapter I in the quote
I was thrown into the company of a most fascinating creature: a real goddess in my eyes, as long as she took no notice of me. I ‘never told my love’
"I never told my love" is an allusion to Shakespeare's Twelfth Light where Viola speaks about never telling the person she was in love with her the feelings she had but whenever she was in the presence of him her body would have tale tell signs of her longing.
In the same chapter the quote
I muttered. ‘The herd of possessed swine could have had no worse spirits in them than those animals of yours, sir
"herd of possessed swine" is an allusion from a story that Luke from the bibles tells about a man who was possessed by many demons but with the help Christ the demons were put into a herd of pigs.
In Chapter 9 in the quote
Who is to separate us, pray? They’ll meet the fate of Milo! Not as long as I live, Ellen: for no mortal creature.
"fate of Milo" is a reference to the Greek athlete was ate by a pack of wolves.