Plot hole: At the end of the first episode, just before Sarah, John and Cameron travel to the future, Sarah blasts Cromartie and you can see his head fly off. In a future episode, Cameron reveals that Cromartie has traveled to the future along with them by pointing out his bare endoskeleton head in the background of the video that was taken of them just after they arrive in the future. It is supposed to be impossible for anything non-biological to time travel, so why is it that Cromartie's head made it through even though it was missing the surrounding living tissue.

Revealing: In the fifth episode of the first series "Queen's Gambit" when Connors and Cameron are trying to save Derek Reese from the police truck Cameron walks on the Jeep's hood to jumps on the police truck. During her walk we can see that it isn't Cameron but a stunt double. She don't look like Cameron and she is a bit taller.

Other: In the scene when Cromartie is talking to the "skin biologist" he has his face covered by a mask. When he asks him "Can you do it?" you can see the mask being blown from inside. This is impossible, because Cromatrie has no flesh, furthermore he has no lungs to breathe. In all other scenes his mask is still.