Visible crew/equipment: During the scene in the pedophile's playroom, there are two cameras that are of interest. Camera A: The film camera mounted on a steadicam; captures what the audience sees. Camera B: A video camera placed on set (as a prop); feeds to a TV screen also on set. Camera A begins on a closeup of the TV screen, and tracks backwards, still facing the TV screen, but revealing more of the set. As this movement is executed, Camera B quickly (presumably unexpectedly) zooms out, revealing the neck (focus and iris rings, etc.) of Camera A for about 2 seconds. This can be seen in both DVD and Film viewing.
Trivia: Throughout the movie, references to the Grimm fairy tales can be seen everywhere. The 'pedophile scene' was supposed to be heavily influenced by the Hansel and Gretel fairy tale. The door mat is German for "Hansel and Gretel" in mixed up letters. Also, the name on the medicine bottle Oleg grabs is Edele Hansel. The prostitute is supposed to be the Blue Fairy, Oleg being captured by the homeless man is Little Red Riding Hood. Above all, the town's name, though never stated, is Grimley. Watch the credits for an animated visual.
Trivia: The sequence which reverses the bullet going through the window, through the bread, and into the wall, in exception for the windows shattering, was not CGI. It was Paul Walker's brother who was sitting at the table with the family. This was confirmed in the documentary on the DVD.