Factual error: This movie is set in New York. In the beginning of the movie, Ryan (Charlie Sheen) is working as a stock broker and is at work in a high rise office building. Library Tower is clearly visible through the window. This is the tallest building in California. Imagine if the Empire State Building was visible in a movie set in LA.
Continuity mistake: When Ryan is talking with Page over drinks/contract discussions, the camera moves in and out from Ryan/Page to Page. In the switch between close-up and distant shots, you see locks of hair dangling near Page's face in the close-ups, but, in the distant shots, her hair is perfectly set.