And Then There Were None (2015)
0 other mistakes in show generally - chronological order
Starring: Charles Dance, Toby Stephens, Maeve Dermody, Burn Gorman
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Episode #1.3 - S1-E3
Deliberate mistake: When the judge shoots himself, the revolver slides across the table, to fake his murder by someone else. But there is no mechanism in place that explains how he does this, making it appear as if he is able to accurately throw/slide the gun after shooting himself. In the original novel, he used a rubber band to achieve the effect, but he is not shown setting it up here.