here's another multi-episode reference:
in "the keys" kramer spews off about how he's been in a fantasy life (e.g. living through jerry's apt: better food, better view (naked women?), and neat (jerry is very NEAT)). now wasn't it in another episode where jerr/laney/george all comment that kramer's life is one big fantasy (e.g. money, sex without dating, no job)