Continuity mistake: When Murdoch and Crabtree arrive to the fairground to apprehend Agnes, they lean their bikes against the "annual fair" banner stretched on a handrail. The camera shows the detective and the constable from behind, making visible that the weight of the bikes make the banner to ruck down significantly. However, when the next cut shows them frontwise, the banner is in neutral position. (00:40:30)
Factual error: Everyone is standing in front of a sandstone building. The construction date literally carved in stone above is MCMXXX or 1930 - long after the show is set.
The Ministry of Virtue - S14-E6
Continuity mistake: Around the middle of the episode, Hart and Carmichael walk down a street with ice cream cones in their hands. When they stop for a brief face to face discussion, the ice cream in the man's hand keep changing from full portion to half-eaten and vice versa as the camera perspective switches back and forth.
Revealing mistake: When the arrow hits Brackenreid, a blood patch appears instantly around the wound. In reality, the arrow itself would clog the bleeding for seconds at least.