so from the notes, from what I can gather, and from some of the articles I've read, here's an attempt at a list:
"Song" by John Donne (the curse)
"The Sun Rising" by John Donne ("busy old fool unruly Sophie")
Hamlet ("Alas, poor Yorick")
Lord of the Rings/Hobbit (the house in Wales called Rivendell
Alice in Wonderland ("we can't all be Mad Hatters")
Howl called a "Bluebeard"
Robert the Bruce, Gretna Green 1306 ("If at first you don't succeed, try, try again")
Howl "Pendragon" is a reference to Arthur Pendragon
Fairy tale allusions:
(@i-didnt-quite-get-that-now pointed out the bulk of these!!)
Cinderella (two stepsisters)
The Wizard of Oz (Witch of the Waste/West, scarecrow, heart/brain/head motif)
Beauty and the Beast (living with a guy and ultimately breaking his curse)
Snow White (running away from home only to housekeep for some guys)
Asking for the princess' hand in marriage as reward for a Task
The youngest son as the one to find fortune, eldest as doomed to fail
Somewhat more ambiguous but you can make a convincing case:
The opening line follows Pride and Prejudice and its "truths universally acknowledged" that then get undermined in the novel
Jane Farrier as an Emma allusion (@toasterchan makes a convincing case for this)
Calcifer and Howl's deal is reminiscent of Faust and his deal with the devil
Sophie glares at Howl and he says "I think that turned me to stone" - Medusa?