Factual error: There is a scene with Gene Kelly dancing at the top of the steps in Montmartre, opposite Sacre Coeur Basilica. In the background you see the lights of the Eiffel Tower. I have seen the view from the top of these steps, and the Eiffel Tower is not visible.
Factual error: The first shot of the calendar shows two days numbered as 20 and March ending on the 24th. In the following shot it's fixed.