Just after the scene where John Cusack had to buy the purple suit at Bloomingdales, in order to get the account info. You will see John come home to his apartment. His fiance is asleep. He grabs a beer can and sits on the bed next to her. He tries gently to wake her. She is not awoken. (Now, here is were you must watch and lisen carefully.) John picks up the beer and puts it to his mouth and starts to drink. His body language clearly suggests that he did not pop the top, yet there was a top-popping sound effect inserted, to suggest the forgotten action. I thought that it was pretty obvious.