There has never been an elevator operator seen before or after this episode. Apartment elevators are always self-serve, going back to at least the 1920's. Apartment buildings don't go to the expense of having an elevator operator 24 hours a day. Especially in the 1990's, when this story is set.
As Paul picks up a box of tea Jamie says "don't use that one, because it has caffeine in it". He looks at the box and says "whoops". At this point, Jaime grabs the box and "says this is not decaf".
It's not clear why they wrote this scene this way. With Jamie first saying it has caffeine in it. And then saying grabbing the same box and being surprised it has caffeine in it.