Episode #1.4 - S1-E4
Continuity mistake: When Richard and the others get back to the police station after accompanying Mrs. Talbot to check her husband's body (or lack thereof), there's a cut to the jigsaw puzzle; it is recycled from the opening of the episode, because the shadows (including those cast by the window bars) are exactly the same. (00:00:10 - 00:06:20)