Audio problem: Despite extensive overdubbing in the scene where Bob returns, the roar of helicopters can still be heard in the background. According to producers on the DVD commentary, the noise was due to firefighting aircraft overflying the sound stage during devastating L.A. brush fires in the Fall of '06. (00:25:30)
Continuity mistake: At the end, Justin's doppelganger lies down in the coffin and "dies," leaving the lid open. The camera then cuts to a wider shot - and the coffin lid has somehow closed itself. (00:37:00)
More trivia for The Dresden Files