I don't have a compiled list, but there are a few errors I'm aware of.
paq'raD, canto 1, line 35, pages 98-99: Kahless blinds Fek'lhr with the reflection off his bat'leth. The English says Fek'lhr but the Klingon has {qotar}.
paq'yav, canto 11, line 2, pages 84-85: The Klingon is supposed to be written without punctuation, but {qaS jajlo', wovchoH chal} has a comma.
Throughout: The Klingon uses {QaD} many times to mean "safe", but in KGT we're told that's slang.
I think there was at least one part where {''} (cha' qaghwI') are replaced with {'} (wa' qaghwI') but that's a little difficult to do a text search for.