Continuity: Episode 19 - Personal Foul; Lindsay is going through the cheerleaders' photos to find a biometric match of the heavier woman, and she picks a head shot of a blond cheerleader. She removes it from the pile to scan it, seeing through the back, we can see what the actual picture looks like. It is a close up picture of a woman wearing big sunglasses. When the scan is complete, it is revealed as the original cheerleader photo.

Plot hole: In episode 4.10, "The Thing About Heroes", Stella realises the 333 stalker is Drew because the jigsaw puzzle piece she picked up from under his chair when she was looking for the missing piece from the puzzle with blue crosses was in fact from the puzzle with green crosses, which they had not yet received. Yet she goes back to the lab and places this piece in to the puzzle to complete it.

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.