Most of the sound was captured by the microphone from the camera because the boom mics were having difficulties. This explains for some of the humming heard throughout the film.
The meeting scene between Ben and Josh had to be rewritten for an interior scene because the shooting was pushed back into the winter months.
Shooting began in September 2007. The next couple shoots were delayed until mid-October of that same year due to scheduling conflicts and technical difficulties. For these same reasons, the remaining scenes were pushed back until late January and February in 2008 with March left for a re-shoot of the library scene.
Editing began shortly after shooting to make the entire process move faster, but the primary editing happened within the 3 days prior to March 28, 2008. Minor adjustments were made variously over the next year, but Justin D. Sims left it alone after March 2009.