Factual error: The bus that Edward stabs has an NYC Transit X90 route marker on it. This route does not go through Times Square.
Continuity mistake: When Nathaniel leaves the hotel room after he hangs Pip in the closet, there is a window shot of him crossing the street and heading to a snow covered sidewalk the next day. But when Pip frees himself and runs outside, there is no snow.
Continuity mistake: When Edward stabs the bus, the length of his sword is inconsistent. For it to reach all the way down as far as it did (as seen from inside the bus), it would have to be much longer than it is throughout the rest of the movie.
Chosen answer: Originally, she was scripted to have a few scenes with Nancy, Robert's girlfriend, in the design studio. The film's producers deleted some of those scenes. You can see that in the DVD under deleted scenes, where she has a slightly bigger part and actually has a small conversation with Nancy about Robert's text message apology.