For 'cannot' the 2nd folio has can, the usual reading. Yet I doubt if the change was needed.
"From whom I took two cods."
Johnson read, as every man of sense would read, peas for 'cods.' I have just shown the origin of the change.
Sc. 5.
"And turn his merry note."
We still say turn a tune and a note. Pope, then, was wrong in reading tune for 'turn.' "When threadbare Martial turns his merry note" (Hall. Sat. vi. 1) was probably in the poet's mind.