Attempting to focus on believability rather than action and gore, Peli chose to shoot the picture with a home video camera. In deciding on a more raw and stationary format (the camera was almost always sitting on a tripod or something else) and eliminating the need for a camera crew, a "higher degree of plausibility" was created for the audience as they were "more invested in the story and the characters". Peli says that the dialogue was "natural" because there was no real script. Instead, the actors were given outlines of the story and situations to improvise, a technique known as "retroscripting" also used in the making of The Blair Witch Project. In casting the movie, Peli auditioned "a few hundred people" before finally meeting Katie Featherston and Micah Sloat. He originally auditioned them individually and later called them back to audition together. Peli was impressed with the chemistry between the actors, saying, "If you saw the [audition] footage, you would've thought they had known each other for years. " During a guest appearance on The Jay Leno Show on November 3, 2009, Sloat and Featherston explained they each saw the casting call on LACasting. Featherston noted they were originally paid $500 for their work.