I find it hard to believe any U.S. distributor would actually take the time to release this to theaters, though the IMDb says that more than one handled this movie in theatrical release! True, the movie boasts an all-star cast, though looking at their brief screen time, it seems just about all these stars knocked off their scenes in not more than a couple of days.
It must be noted that the U.S. print is cut; I've heard from one source that the Italian print does make somewhat more sense. All I can do is judge this particular cut - which makes NO sense at all! People make schemes that are never explained, weird things happen for seemingly no purpose at all... it's a BIG mess! One example is with Italian superstar Franco Nero, who (because of the editing) only gets to appear for about 30 seconds at the end of the movie!
I will admit that at the very least you can salvage a decent number of unintended laughs. Not only is the movie so insane and incoherent that you can't help but laugh out loud, there are some individual delirious scenes that are wacked-out as well. The skating rink scene... John Huston impersonating a babysitter... John Huston playing pong with the mysterious girl (though it's clear that it's a one player pong game on the TV screen)... Shelley Winters overacting... and more. It's not a constantly hilarious experience, and you're bound to get frustrated to a degree with the garbled storyline, but the experience can't be seen as a total loss as well.