Plot hole: In Episode 4-4, "Times Up," it is stated that Kevin Murray will be killed at 9:45. When Mac is standing over the dead body, he looks at his watch. It is 9:45 and he says, "Right on time." Unless Mac was standing on the sidewalk when he flew out of the window, he actually would have died earlier, since it would have taken time for the police to be called and arrive on scene.
Plot hole: The coroner found the ticket stub in the throat of the guy whose tongue was cut out, he died in the ER. The ER staff would have have found the ticket stub while trying to save his life. With the tongue being cut out they would have opened up his mouth to stop the bleeding.