Bad Medicine - S1-E8
Revealing mistake: Footage of the Diablero standing up after killing the first rich woman is re-used in the killing of the next rich woman, evident by the shot of the same curtains in the background for both murder scenes.
The Vampire - S1-E4
Continuity mistake: At the press briefing, Lt. Matteo is standing next to Kolchak with a tall reporter in a gray suit standing behind them, but the next quick long shot shows the reporter in the gray suit standing between Kolchak and Matteo.
