There is a poster of it in the house that nicola lives in
"Did you see 'Stromboli' with Bergman?"
poster above prostitute's bed
Strong narrative and thematic connection (brothers who love the same woman on more than one occasion)/borrowed musical score throughout
Matteo lowers his glasses like Marcello Mastroianni.
Scrooge McDuck mentioned/first appearance
characters repeatedly mimic Brando's Don Corleone
Nicola took Sara to see this movie
Musical quotation of Highlander theme early in Part II - an oblique reference to that film's plot, to suggest where the relationship between Matteo and Mirella will lead.
on movie marquee
The character Giulia goes into a movie theater to meet a Red Brigades contact. The film showing is "Les Parapluies de Cherbourg".