Like I said, right now I have nothing better to do than go to movies, and a movie like that I go in with no expecations so it will be hard to be disappointed.
Read autobiography then. I started reading it thinking I'd just read the first volume. After 3,500 pages I wanted more, since it only goes up to his mid 50s.
There's also a good story behind it. Only bits and pieces were published throughout the 1800s. The original manuscript was presumed lost. When U.S. troops entered Germany during World War II, they found the manuscript in an ancient castle. The deal is, Casanova lived out the last years of his life as a librarian to a German (Bohemian) royal. He looked after the books, but also entertained guests with stories -- playing the role of human jukebox. Between these tasks, he started writing the story of his life. He was Venetian, living in Gemany, but wrote it in French. It wasn't translated into English until the 1960s.
Anyway, it's well worth reading.