{Huy'reH} and {cha'ang}, at least, seem to follow proper modern {tlhIngan Hol} phonology. 

{Qich'lut} has a lower-cased "i" and an out-of-place {qaghwI'}.

{paq'jachchu} has that apostrophe after {paq} and a missing {qaghwI'} at the end (if the {jachchu} part is indeed the verb {jachchu'}, as the English translation seems to indicate). On p.xxx, it is explicitly stated that the name {paq'batlh} is in {no' Hol} and that the apostrophe may be a clue to some missing grammatical element. Of course, the book also has sections named {paq'yav}, {paq'raD}, and {paq'QIH}. So {paq'jachchu} is probably just spelled weirdly for the same reason.

Should {Huy'reH} and {cha'ang} be accepted as canon Klingon words as-is? In other words, would you expect them in a new words list? (In particular, I am asking if they should be listed in {boQwI'}.)

The word {Qich'lut} is spelled that way all three times it appears in the book. I notice that in previous discussions on this mailing list, 'IQqu' and Voragh have both spelled it as {QIch lut} (capital-I, no apostrophe, space between the two words). Should {QIch lut} be accepted as the "modern" spelling for the purpose of look-up in word lists?