[Stephen]

There was reference to Kahless, and how he created the first Bat'leth which was in a TNG episode.

'He took a lock of hair and flung it in the Volcano, to create the first Bat'leth.'

Apparently the fanatical Klingons we saw were inspired by that and got rid of their hair. Also there was mention that we only saw 6 of the 24 houses.

It is good though that the current show runners are trying to undo all the screw ups within canon/continuity and find ways of correcting them.