Mid-way through the film, Minnie Driver and John Cusack are having drinks at a table in a bar. A drunken friend staggers over to the table and spills her Martini as well as some of their drinks. The scene continues and with every camera angle change, the drinks are full then not.
Also in that scene you should notice that while the two are chatting the waitress brings 2 drinks to them, both in rocks type bar glasses. As it shows minnie driver close up you see the top of a martini glass in front of her, but she didn't have a martini. Once the drunk friend comes over, SHE is carrying a martini and spills it. Its just funny that the martini glass is in the scene before the drunk girl even comes to the table......little snafu there