If something in Veep happens exactly like something in one of the greatest and/or most well-known, most obsessively quoted comedies of all time, with which it also shares a starring actor, I'm going to go with homage over coincidence. Seinfeld especially has become so ingrained in the American vernacular that you can reference it without even realizing it (not that there's anything wrong with that), so even if the writers aren't consciously doing it--which I suspect they are a lot of the time--the references are still in there.
Anyway, back to the fun. I just remembered another one: I don't recall the episode or exact quote, but Selina mentions "afternoon delight" in reference to sex. Squee!
Also, in the third episode of Season 2: Gary points out that paper covers rock.