Fellinis Batman
Imagine how insane it would have been if Fellini had directed a Batman movie. Batman the psychedelic,demented dark knight. One can only wish.
I don't think the Batman character was Fellini's cup of tea really - it was another comic he wanted to adapt: Mandrake. The "Mandrake" film is one of his many projects he never got round to realizing; all that's left of this idea is Marcello Mastroianni's costume in "Intervista": Marcello appears on Fellini's set dressed as Mandrake, pretending he was just passing by from another set where "Mandrake" was actually being filmed.
http://en.wikipedia.org/wiki/Mandrake_the_Magician
Regards, Rosabel
EDIT: I only just noticed that Marcello in the Mandrake costume is on the cover of the American DVD, you can see it on the board of "Intervista".