Factual error: Willie opens the secret room in the Collins family mausoleum, and a flock of bats flies out. It's a hidden chamber that's been sealed (without even small openings - it's imprisoning a vampire) for 200 years. There'd be no way for the bats to get in. (00:15:00)
Dark Shadows (1991)
1 factual error in season 1
Starring: Joseph Gordon-Levitt, Ben Cross, Joanna Going, Jim Fyfe
Episode Five - S1-E5
Revealing mistake: The mirror over Barnabas' mantel hangs flush against the wall. Yet when he shatters it, the candlestick he throws can be seen to go through the glass instead of bouncing back as it should have done. (00:43:45)