After reading several of the user comments on this movie, it is clear that many people missed quite a bit. Those "funny one-liners" (and there are plenty!) are much more than that: they tell us volumes about the characters. This movie certainly does not spell anything out to the viewer (except, perhaps, the obvious), so you must be able to find the meaning behind the words. If you listen to what the characters are saying, then you can understand their past relationships, their present feelings, which friends have stayed close, etc. Remember, these are old friends: the script is very realistic so the characters are not going to explain every line to one another. I believe to truly enjoy this movie you need to pay close attention to all of the details and understand a bit about the attitudes and ideals of the two eras the movie depicts.
Wonderful, intelligent movie!
Wonderful, intelligent movie!