Factual error: When Cindy wanted a hitman to kill Ian she looks in the yellow pages to find one. Surely the police and the makers of the yellow pages would have been alerted if a hitman agency wants to advertise itself in the yellow pages?
The Murder's in the Mail - S1-E6
Factual error: Dead blonde guy is sitting upright in the chair, as Dave/Maddie close in, and Maddie realises he isn't moving. David goes to him and smacks him across the shoulder, to "wake him up" and blonde dead guy, right on cue, instantly slumps over a table at his right side, when the direction that David hit his shoulder, should have sent the dead guy slumping more forward, then at the front edge of the table. Obviously staged for the actor's comfort.