Plot hole: It seems strange why Alison and Cynthia Keener don't raise any suspicion with Wheeler's mother after rescuing her daughter Joanna. After Keener finds her and the other missing girl, she says to Alison that the kidnapper had taken them and had been torturing and abusing them for a number of days. However when Alison and Cynthia go to talk with Wheeler's mother about the old kidnapping case (before the two were rescued) the mother states that she has never been kidnapped and had even saw her yesterday. While the mother might not have been aware of her daughter's kidnapping, wouldn't she have been a little perplexed to have found her daughter had been kidnapped and tortured during days she had seen her. Even if this was something that was not shown, why wouldn't Alison and Cynthia (someone who is well trained in kidnappings) find the mother's statement combined with the kidnapping a bit strange.
Girls Ain't Nothing But Trouble - S4-E5
Other mistake: In the "Silent film" sequence at the beginning of the episode, the D.A. comes in to take the family's home from them. Allison and the kids gather on the bed, and are supposed to be terrified. However, the actress portraying little Marie begins to laugh at one point. (00:01:02)