Corrected entry: When Derek is shot and needs a transfusion, they first offer up Sarah as being O negative, the universal donor, but it is turned down as he needs his own blood type, AB positive. John then states, "Test mine," and his is magically AB even though his type could only be A, B or O with his mother as type O. To be AB, his mother would have had to have been A, B or AB. This was required to have John donate to Derek and to allow Sarah to offer as O-, but is factually impossible.kiskia
Corrected entry: At the end of the pilot episode, just before Sarah, John and Cameron travel to the future, Sarah blasts Cromartie and you can see his head fly off. In this 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?