KRAMER: (scanning a menu) So, how was the dinner last night?
JERRY: Oh, well…
KRAMER: Did you enjoy the duck? (Elaine comes over…) Oh, Elaine! I was just asking how dinner went last night.
ELAINE: (sitting down) Oh, well…
KRAMER: Alright, what did you do to Poppie?
KRAMER: Well, he's in the hospital. And the cook says you put him there.
ELAINE: What's wrong with him?
KRAMER: I don't know. I'm gonna go and visit him later. It would be nice if you got him something. (Punches the table to accentuate this and leaves.)
JERRY: We should get him something.
ELAINE: Yeah. You're right.
I don't understand why Kramer first says the dinner, but when he says it a second time, he drops the article. What's the reason behind that?