There is rather infrequent strong language in this, and that is the only real objectionable material in it. The anecdotes alone are very much worth watching this documentary for. It's edited well, and informative and entertaining throughout. This is well-paced, with a 20 minute running time. We hear about Pesci and DeNiro, how the first was in general during production and how the latter helped Sharon out. They go into the off-camera relationships between the actors, the many interesting casting choices, some of Scorsese's directorial methods, and more. The person who gets the most time(meanwhile, it never gets to be boring) is Stone, and we get the full back-ground story for her taking the role, and delivering her astounding performance.
It consists of interviews, clips of the movie, behind-the-scenes footage and stills. This is one of six featurettes on the 2-Disc Special Edition DVD of Casino, and one of the four of them that have their own page here on the site.