(Naked spoilers ahead)
I don’t know why I was thinking about this (probably prompted by the “worst TOS episode” thread), but I just thought of a pretty huge plot hole.
(and no, it’s not the obvious one regarding the mix-up of Sulu’s mission (“charting gaseous anomalies”) and the Enterprise’s).
OK, so the Klingons meet with the Enterprise. Gorkon and his crew (including Chang) are traveling together. Then, all hell breaks loose - the Klingon ship is fired upon, presumably by the Enterprise. Turns out, there’s another ship - a Klingon ship that can fire when cloaked. Later on, the cloaked ship and the Enterprise get into a battle.
Who’s commanding the cloaked Bird of Prey?
OK - how did he get on that ship, and why didn’t any of the crew of the Ambassadors’s ship ask where he went?