but he couldnt talk Doohan to shave that moustache?
That was an obvious and avoidable visual continuity break I think. I'm serious. 10 years of ageing for the actors and all the prduction value added to TMP related to the series, I couldn't recognize Scotty in the movie. I was like, who's that guy?
In comparision, McCoy had a beard and shaved it for military duty.