In this episode both George and Elaine are sitting at Monk's talking about Jerry. They are taking about the coffee (Morning Thunder) that Jerry drinks has caffeine and that Jerry doesn't drink caffeine and that he doesn't know his coffee has caffeine in it. Well, in "Good News Bad News" when George and Jerry are eating the waitress is serving both of them the same coffee and later tells Jerry that the coffee she had served George had caffeine in it, Jerry laughs and we assure Jerry does drink caffeinated coffee. Also while Elaine and George are at Monk's talking about Jerry that both acknowledge that they have seen Jerry throw-up before. We later learn in "The Dinner Party" before Jerry throws-up at the bakery he tells Elaine he hasn't thrown-up since 1981. Now, in this episode (The Dog) Elaine tells George she has lived in New York for six years. This is in 1991, if she has only lived there for six years she wouldn't have known Jerry before hand, so hence she couldn't have seen him thrown-up before.
