What killed me in this one was Howard's smile. The episode was masterfully directed.
I agree about those character-defining details. I think we've had more than enough of the cup holder, though. I'm not sure I needed four installments of that subplot; I got the picture after the first one.
The light switch was leagues better. You had the clever contrast of Jimmy ignoring that sign in the episode, but forced to obey the emergency exit sign in the cold open.
Howard's treatment of Kim is almost enraging at this point. I think it's forcing me to remember that he never really seemed to have a great deal of respect for her. The threat of his disapproval always seemed to be looming.
Also, as a boss, Howard is just the worst. You're not supposed to cultivate drama and resentment. And you should not make your employees believe they're one mistake away from banishment. They'll simply decide not to work in an unfair environment, as Kim is (hopefully) doing.
I wonder if we'll see any further justification for Howard's "approach" to Kim. Because even considering everything we already know, he's being a dumb baby.