http://www.allocine.fr/personne/fichepersonne-4819/interviews/?cmedia=19557577

http://www.premiere.fr/Cinema/News-Cinema/Video/Keanu-Reeves-Knock-Knock-c-est-un-film-romantique-4263519

http://www.amazon.co.uk/exec/obidos/ASIN/B013QQ154Y/dvd3netdvdforthe

http://moviepilot.com/posts/2015/10/01/the-green-inferno-to-knock-knock-the-bloody-best-of-eli-roth-3567476?lt_source=external,manual

Later edit: this one is definitely for the archive
http://www.complex.com/pop-culture/2015/10/keanu-reeves-knock-knock-interview

FANG: Keanu's "free pizza" monologue while the girls have him tied up is one of the film's highlights. How much did you direct him in that scene? Did you just give him the words and let him go, or did you only have him go so far with his delivery?

ROTH: We kept joking and telling Keanu, "This is your Oscar clip, no pressure!" That monologue Nicolás and Guillermo and I wrote basically expresses the whole theory of the movie-that if free pizza showed up at 2 in the morning, every guy would take it. When we were rehearsing it, Keanu just started riffing, and we were laughing so hard we were crying, and were like, "That's what we want." We wrote down everything he was saying, and rewrote the monologue for him.

We were filming nights, and it was a very, very tough shoot. This wound up actually being as hard as GREEN INFERNO [which Roth discusses here and here], just in different ways. Because we were essentially shooting in a glass box, any way we lit it, anywhere we wanted to put the camera, there were reflections everywhere. And the house was so beautiful, I wanted layers and depth; I didn’t want you to feel like you were in a house, I wanted it to look big and beautiful and cinematic. Anyway, when we got to that scene, it was 5 in the morning, and Keanu was just out of gas. So we said, "Let's stop, because this is too important; let's start again tomorrow night."

So Keanu rested, and he came in at 7:30 the next night. That scene was the first one up, and he just nailed it; he was amazing. We were watching, and just couldn't believe it. That's the kind of guy Keanu is; he just gives you everything he has until he's out of gas, and people really don't give him the credit he deserves as an actor. They're not necessarily kind to him about his performances, but when you look at the range of what he's done… I mean, there's the action-hero Keanu in THE MATRIX and POINT BREAK and JOHN WICK, but then there's the comedic Keanu in BILL & TED, MY OWN PRIVATE IDAHO, DANGEROUS LIAISONS… He's done so much that it's no accident he's been a star for so long. And when you see him in that scene, he's angry and vulnerable, and just giving everything.

I feel like we're just seeing the beginning of the Keanu-ssance right now, where he's starting to do the dad roles, and it's fun to watch a guy who you're used to seeing save the whole planet get led around by these two girls who are constantly one step ahead of him. We were joking that KNOCK KNOCK is actually a version of THE CAT IN THE HAT, with Thing One and Thing Two running around being crazy, and he can't control them. He thinks he's smarter than they are, he thinks that because he's an adult, he knows better. But there's that moment when he realizes that these girls could just wreak havoc on his safety, and all the things he has built up to protect himself.

Just my opinion. It's widely available on VOD, at least here in the US - that's how I saw it.

If you like dark, judgmental " humor" I suppose it's clever. I don't like Roth's " humor." I have no idea, beyond the broadest strokes, what motivates the two girls.

I'm sorry if I mislead with my earlier post.