david yates interview form the sets of hp

In the Great Hall of Hogwarts School of Witchcraft and Wizardry, breakfast is underway, tables heaped with sausages and toast, casually dressed students talking and eating. Ron Weasley (Rupert Grint) stands in the doorway, dressed in full red-and-gold Quidditch kit, nervously surveying the room.
He enters. Fellow students slap him on the back as he walks down the central aisle. "Good luck, eh, Ron?" "Countin' on you, Ron!" "I've got two Galleons on Gryffindor!"
A huge guy blocks Ron's progress. He stops, they do a side-to-side dance, Ron has to squeeze by the guy to get to his table. Cut!

So I think you were quoted as saying this movie's about sex, drugs and rock'n'roll.
Yates: Yeah. I want to amend that. It's actually about sex, potions and rock 'n' roll. … It's a wonderfully fun, slightly rebellious, quite naughty stage of teenage life. When you're kind of discovering the opposite sex. … In the previous film, it was about the first kiss. This film is a bit more sexualized than that. You know, in a way. We don't see sex, but it's kind of in there. And the relationships are a bit more complicated and romantic and convoluted. So we're pushing into new emotional and kind of physical territory for Harry Potter, you know, in a way, so it's quite playful and fun.

Can you talk about the scene that you're shooting now?
Yates: Yeah. This is a, Ron's big Quidditch match, and he's really nervous, and he's not very good, and he's terrified, frankly. And so it's really about him building up to the game. And Harry [Daniel Radcliffe] pretends to slip some Felix Felicis, which is this potion that apparently gives you great luck, and Harry's going to pretend to slip it into his drink to give him this bravura, which he doesn't have. So it's a gentle, funny scene about Ron's trepidation about playing Quidditch.

How have the actors changed since the last film?

Yates: That's interesting. Emma [Watson, who plays Hermione,] has become much more confident. I mean, she was confident before, but ... her acting ... is becoming more effortless. Dan's been off and done Equus and some television things, a television film, and he's grown a lot more confident and matured a wee bit. And they're all getting a wee bit older, and the material allows them to take a few more turns, again. They're getting better, as they should be as they get older, you know, so it's encouraging and enjoyable.