Corrections
The whole book constitutes nearly a half-million words, so I know this list will grow:
(Corrections in green have been incorporated into the Second Impression of the book, July 2004.)
p. v, title for p. 646: for "Dethe" read "Deth"
p. xviii, entry for c. 1190: for "Athurian" read "Arthurian"
p. xxxvi, third-last line: for "from" read "form"
p. xl: for "pre-vowel shift" read "pre-vowel-shift"
p. 8, line 22: add quotation mark after "here"
p. 113, line 9: for "There" read "there"
p. 149, n. 5 (2): for the date of the fall of Constantinople, read "1453" for "1456"
p. 151, last line of title footnote: for "prose Prose" read "Prose"
p. 265, line 17: remove quotation mark at the end of the line
p. 342, line 36: for "withoutt" read "withoute"
p. 462, footnote 8: for "CF." read "Cf."
p. 481, line 21: for "to ys" read "to hys"
p. 501, line 4: insert the following rubricated comment (represented by the black-letter font) in the right-hand margin:"How Sir Galahad pulled the swerde out of the peron"
p. 566, line 18: add quotation mark at beginning of line [ "That nyght . . . ]
p. 590, footnote 8: remove ", which" after "Fruit"
p. 595, line 31: remove quotation mark at beginning of line
p. 596, line 17: for "han they" read "Than they"
p. 646, title and running titles: for "DETHE" read "DETH" (the "-e" spelling is normal for Malory, but this edition's policy is to retain Caxton's spellings where Caxton is the source of the reading)
p. 689, line 25: entire line should be in black-letter (i.e., the whole inscription is in red in the manuscript)
p. 761, line 8: for "onw" read "own"
p. 763, line 7: for "he" read "the"
p. 764, line 18: remove apostrophe before "remitted"
p. 770, line 5: for "Mortyiner" read "Mortymer"
p. 859, block quotation: remove second sentence ("Therefore ones shall I . . . all holé togydirs."); add "line 5" after "p. 502"

John Talbot, Earl of Shrewsbury,
killed at the battle of Chastillon, 1453.