Adrienne seemed completely neurotic to me. Also, she could not hold her liquor. She had what, 3 shots of Jack Daniels in that one scene and then had to go pass out 20 minutes later? Pfffftt lightweight.
Wait, you're talking about the characters in the movie? The movie itself was only average. Diane Lane is well above average.
As far as light weights go, my wife has most people beat now. When we were young, she was able to out drink most men. Now, she feels one wine cooler. It's a not a bad thing...
Me: *Buys a fifth of Patron*
Me: *Leaves wife unattended for 30 minutes*
Me: OMG! What happened to all the Patron?
Wife: *giggles* *hiccups*
Me: Am I gonna have to hold your hair back?
Wife: Maaaayyyybe. Will you make me grilled cheese?
Me: *sigh* The things I do for love.