You can spot this slipup during one of the final scenes of the movie, when the four main characters are standing in the airport. Right after Cooper gets off the phone with his boss and he tell the others "They fired Humphrey. I got his office and a raise." You can hear an announcer come over the intercom and say, "Flight 341 from Rome to Cleveland is now boarding." The only problem with this is, no airline flies directly from Rome to Cleveland. They would have to board a connecting flight in a city such as New York or London, for example. This slipup could be spotted at 1:23:15 of the Unrated Version of the DVD.