Knock Knock is the story of Evan (Reeves), a man whose good intentions lead to deadly consequences when he helps two strangers (Izzo and Armas) who ask for his assistance. The devoted husband and father is left home alone for the weekend when he encounters two stranded young women, who unexpectedly knock on his door for help. What starts out as a kind gesture results in a dangerous seduction and a deadly game of cat and mouse. (Gary Reber)
Special features include commentary by Director Eli Roth, Lorenza Izzo, Nicolas Lopez, and Colleen Camp; the featurette The Art Of Destruction (HD 14:42); two deleted scenes with optional audio commentary by Roth (HD 04:51); a still gallery; upfront previews; and an UltraViolet digital copy.
The 2.35:1 1080p AVC picture was photographed digitally and exhibits a nicely pristine image. Resolution is excellent, with fine detail throughout the home exhibited in art objects, furniture, clothing, hair, and facial features. The color palette is brightly hued with solid saturation and hues that pop. Colors are varied but always pop. Fleshtones are natural and healthy. Contrast is well balanced with deep blacks and revealing shadow delineation. This is a vivid picture that is naturally hued and visually engaging. (Gary Reber)
The DTS-HD Master Audio™ 5.1-channel soundtrack is often dynamic, with a rainstorm in the early scene providing effective atmospherics and engaging surround, as well as music spun from a DJ turntable in the home. Other sonics occur in the home in the natural course of the unfolding events. The focus is dialogue, which is well integrated spatially.. The music score is at times haunting and mysterious sounding, and nicely recorded with a subtle but enveloping surround presence. Deep bass is extended during the more intense segments and provides a dynamic intensity. This is an intense-building soundtrack that charges the emotions. (Gary Reber)