John Travolta traveled to Hong Kong to study oil painting in order to prepare for his role in this film.
The same Monet painting - Woman with Parasol , is used in the film Die Thomas Crown Affäre (1999) with Pierce Brosnan.
At about 14 minutes in, Gramps, Will, and Ray are watching a movie on TV. The film is Opfer der Unterwelt (1949), directed by Rudolph Maté, starring Edmond O'Brien.