Factual error: Talking to Dresden, Bob refers to his first grimoire (a book of spells & magic). But the closed captioner, apparently unfamiliar with the term, has rendered the line, "My first Renoir," which, though amusing, makes no sense at all in the context of the conversation. (Refers to the aired version: the error was corrected on the DVD release.)

Continuity: As Harry talks to Murphy from inside the jail cell, his arms are wrapped around two bars with a third bar in the center. When the shot cuts to a wider angle, his arms are no longer draped through the bars: he's instantly standing straighter and holding onto the center bar with both hands. When it cuts back, he's in his original position again.

Continuity: After Bob's ghost is summoned in the park, Dresden walks off screen right, carrying Bob's skull in both hands. But in the next shot, the skull has vanished. Dresden has neither a bag nor pockets large enough to have put it in.

Continuity: When Murphy questions her on the park bench, Heather's hair changes repeatedly between takes, from tucked behind her ears to having several strands hanging loose in front of her ears.

Continuity: Sarota the hellion leaps through the window, and all the glass breaks out. The shot changes to an inside view, and two large portions of window glass now remain in the frame.

Continuity: Karen hits Dresden with a glass bottle, striking him on the back of the neck. But in the next scene, he's holding a cold compress to a wound on the side of his forehead.

Continuity: When he's in Arvin's apartment with Bianca, Dresden's hair gets mussed and is standing up in tufts at several points on his head. Between takes, though, it neatly combs itself.

Continuity: Dresden is missing, and Murphy comes to his office for clues. The right side window shade on the front door is pulled all the way down, and still is when Murphy leaves. But when she returns with a rescued Dresden at the end, the right door shade is halfway up, even though no one has been there to raise it.

Continuity: At the end, when Dresden locks the double doors to his office, the window blind on the right is rolled up higher than the left one. But when he turns to talk to Bob, the left blind is suddenly several inches higher than the right one.

Continuity: In the opening scene, the scrambled eggs on the breakfast plate, without being touched, change from being spread across half the dish to being bunched up into half that space.

Continuity: 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.

Revealing: A recycled shot from an earlier episode causes Bob to enter the room wearing one costume and then suddenly be wearing another when he turns to begin his scene with Dresden and co.

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.

Deliberate "mistake": Kermani finds a nitroglycerin tablet in the suspect's apartment. Because we need to see it when he holds it for the close-up, the tablet he has is much too large to be nitro. That drug is dispensed as an extremely tiny pill designed to dissolve instantly under the tongue.