Martin Scorsese has said he wanted to make The Wolf Of Wall Street "ferocious", but even he was made uncomfortable by some of the scenes.
The director told The Wrap about the process of making the film that stars Leonardo DiCaprio as corrupt stockbroker Jordan Belfort, which drew heckles at a recent Academy screening.
He said: "I told [editor] Thelma [Schoonmaker], 'I want it ferocious. I want an attack.' That doesn't mean the attack can't have humour, but it's a dark humour."
Scorsese, who used improv in some scenes, described one that had made him uneasy: "There's the cries of 'Wolfie!' - and I hate to say it, but Wolfie was Hitler's nickname.
"Watch those rallying scenes. [Jordan Belfort] gave them something to rally around, to be like him. 'Wolfie!' made me extremely uncomfortable when they started yelling that in the scenes. No one mentioned it, but I sensed it. It's mind control."
On the comparisons of the film to Goodfellas and Casino, Scorsese said: "Everybody is saying it, so what can I do? These are comparisons. Yeah, it's another look at America, another look at who we are. And a look at human nature - it doesn't happen just in this country... basically it seems like part of a trilogy, in a way."
However, some of the audience at the Academy screening found the film uncomfortable to watch.
Actress Hope Holiday wrote on Facebook: "Last night was torture at the Academy - 'The Wolf Of Wall Street' - three hours of torture - same disgusting c*** over and over again - after the film they had a discussion which a lot of us did not stay for - the elevator doors opened and Leonardo D. Martin S. and a few others got out then a screen writer ran over to them and started screaming - shame on you - disgusting."
Scorsese himself told The Wrap: "It's brutal. I've seen it with audiences, and I think it plays. I don't know if it will be to everyone's taste - I don't think it will. It's not made for 14 year olds."