Photos
Lux has posted a gallery of photos. Thanks to Ayako for tweeting the link.
Videos
iNCREDiPiNOY has posted a clip of Eli Roth introducing the cast and everyone else associated with the production on youtube.
Rotten Tomatoes has posted their interview with Keanu on youtube.
Roxanna Bina has posted her interview with Keanu Reeves on youtube.
Made in Hollywood Teen posted their interview with Keanu on youtube.
Update: Fox411 has posted their interview clip on their site.
Update X2: Daily Dead posted their video interview with Keanu.
Reviews
Update: Glenn Kenny reviewed Knock Knock for the NY Times.
Richard Crouse reviewed the film for CTV Canada AM and gave it 1.5 stars.
Peter Howell reviewed the film for Our WIndsor and gave it 2/4 stars.
Update X2: Chuck Bowen reviewed the film for Slant Magazine and gave it 2/4 stars.