Received three of the most important awards at the 2001 Cannes Film Festival ( Grand Prize, Best Actress, Best Actor ). Since this edition of the festival, there is law which forbids for the jury to give so many important prizes to the same movie.
Erika walks through a snack bar. On its back wall, theater posters can be seen for a motion picture, "Frequency". Frequency  is a real movie - which isn't about music - filmed in Canada and the US. Each key on a piano has a unique frequency.