Other mistake: The scene of Kolchak robbing the grave is recycled from the episode "Zombie."
Visible crew/equipment: As Mrs. Sherman tries to control her dog, Randolph, a crew member's hand (possibly the dog trainer) is visible on the right side of the screen.
Continuity mistake: As Kolchak talks with Ryder Bond about the Doppelgänger, Bond's left hand instantly goes from being on the piano to his forehead when the scene quick cuts.
Revealing mistake: As Kolchak drives down the street, tall palm trees are visible in the background. Palm trees would not grow in the climate of Chicago in early September, when this episode takes place.
Continuity mistake: As Sgt. Mayer speaks with Mrs. Sherman, Mayer's arms change position from behind his body to crossed, then back as the scene cuts.
Continuity mistake: While George Mason lies on his bed, his hands are crossed on his stomach. In the next shot, before he bursts into flames, his hands are at his sides.
