Hi Jorgen. I have not seen Marlena. Most Fellini movies have Giuliettas in them; whether Spiders or Sprints (I'll pull up some titles).
My favourite movies with Alfas (more than a few second show) are as follows:
-The Graduate (To me it's a movie about a Duetto)
-CQ (Another Duetto ". . .he smasheetap his Alfa. . ")
-The Destroyers (Montie, GTV's, Sprints,a 2600)
-The Italian Job (I never even saw the Minis

)
-Octapu$$y (I think that you have the video on your site)
-Excellent Cadavers (Apparently the only cars in Sisely are Alfas)
-Love Potion #9 (Adrian Paul says he owns Alfa Romeo in it)
-No way out (Costner flirts in a nice Quadrifoglio Spider)
-Pink Panther (a chace scene at the end with a Ferrari, an Alfa Manta, and a 1900 Ti, and a 500; they all crash into each other)
-The Man Who Loved Women (The original French Version, in which Marceaux drives a Ti Super to work and smacks it into a pole to meet a girl)
-Blue (A really nice Blue mettalic 164 crashes into a tree in the first minute of the movie

)
-I'm too sexy for my car Video (Does he really think he's too sexy for that Duetto? Not in That outfit!)
There is also a nice show of Italian playboys in Alfas and Fiats in most "Beat at Cinecitta" movies from the sixties. (XXX)
Any more?
Regards,
Taso