Having started this very late I have only just finished. I must say I found it very tough. Filling two-thirds of the grid was relatively straightforward, but getting the rest was not, and I must have spent as long on my last five or six clues than on all the rest put together. Obscure words or meanings from wordplay that also involves obscurities made some clues pretty fiendish. A seven-letter entry with three unches (normally a no-no) and three clashes? Hmmm. I'm not sure I'd call that fair.
It was also tough to track down the quotation. Although it's in ODQ none of the words in the line given by misprints appears as a keyword in the index as far as I can see. That strikes me as unfair because it's virtually impossible to find such an obscure quote on Google without most of the words identified. I had a justifiable alternative misprint which hindered my search for the quotation. The only word that I was absolutely sure of was the last one, which ought to have been significant enough to get the quote, but I failed for a long time even when I linked up with some others and some guesses. With so many wrong letters I was basically cold-solving most of the clues.
Wintonian, I disagree that 9d doesn't have a misprint If the clue doesn't have a misprint the entry is as per the answer, which ruins the thematic sequence.
Notrab, 42a must have a letter that is wrong for the answer but right thematically because its clue has a misprint. The only possible cell is the first because there are no clashes anywhere else in the entry.