When Maria shows David a globe, David asks her to show him Denmark. The camera focuses on Denmark, then traces down the globe to Italy. Though antique in appearance, modern country names on the globe (Czech Republic, Slovakia, Bosnia) shows it dates at least from 1993.
When David arrives in Denmark and sees his mother waiting at the airport, the sign on the building is missing the letter h, and says "Købenavn" (in english it would say Copenagen instead of Copenhagen)
In the window of the Italian bookstore, the book on display next to the book the protagonist is looking at, is clearly, "Cieli e mari: le grandi crociere degli idrovolanti italiani (1925-1933) / Ranieri Cupini". The first edition by Mursia was in 1973, long after the events in the movie.