On the plane, while being escorted by FBI agents, Frank Jr sees New York's LaGuardia Airport and says, "There it is, LaGuardia Airport, runway 44." A runway numbered 44 is impossible. No runway can be numbered over 36 because there are 360 degrees in a circle.
The real Frank Abagnale Jr. was held in the French prison (Perpignan's House of Arrest) for approximately six months. His term was shortened from twelve months. When released (extradited to Sweden), he was quite ill because he was forced to live in a damp, dark cell, naked and allowed only bread and water to eat. He was next sent to Sweden, where he was tried and convicted. The Swedish prison was quite comfortable. However, upon completion of his prison term in Sweden, he was next to be extradited to Italy. The Swedish government believes in prison reform and was afraid of the treatment he would receive in an Italian prison. As a result, Sweden revoked Frank's passport so it could intentionally have him extradited to the U.S. Once in the US, he was protected and couldn't be tried in all the foreign countries he perpetrated his fraudulent schemes. This can all be confirmed in the book, which is a much more accurate depiction of his life and was written approximately 10 years prior to the release of the movie.