at least we know he’s really drinking something and not just sucking on an empty cup like so many of them do. I especially notice that when they are drinking out of a paper cup and set it down and the noise it makes gives away that it’s empty. Geeze, at least put some water or something in it so it doesn’t make that empty "clunk."
And he’s still smilling at, what seems to me, inappropriate times.
is just an “affect” of the actor. If it is, he should be more conscious to try and eliminate it. Alternately, maybe he thinks it’s a part of his character?