Plot hole: Ruth enters Darlene's home at night, crossing over the crime scene tape. She proceeds to the barn where she finds all of Darlene's heroin packed up neatly. This is factually impossible. Once the police had secured the crime scene in the house, they would have searched the entire property and would have discovered and seized the heroin at that time. (00:54:38 - 00:56:09)
Episode #2.6 - S2-E6
Plot hole: Laura is spotted at an airport where it is assumed she goes to Edinburgh. Although she mentioned later on she broke her bail by leaving the 30-mile radius by her bail conditions. This wouldn't have been possible as part of her bail was to surrender her passport.