I’ve argued this point before, but, as the resolution of the conflict
depends upon the Klingon General-turned-ambassador Korrd, they should have devoted
some development to this character! It's not as if the movie was too long, nor were there cringe-worthy material that could have been lost.
As it plays, The General is there for crude humor, muttering, drooling and belching, until the denouement, where he reasserts long-dormant authority out of left field to discipline the young Klingon troublemaker and save the day. (There has even resurfaced a deleted scene that makes him worse.)
Why not have some dialogue that suggested that the General wasn't discredited for military incompetence, but maybe for, oh, a misguided show of mercy to a vanquished people? Why not give him a face-to-face scene with that guy who plays Kirk, discussing his fall from grace, and having the latter guy remind him of his former glory, setting up the climax? (If such a scene couldn’t fit into the existing plot, it could have been a flashback to a much earlier meeting.) Why didn't the director, whomever it was,

think of
that? It wouldn't have added very much to the budget.