Factual error: Joel is using a ham radio set to contact his old colony. A shot of the radio set shows it is set to "CW", which is Morse Code, but he is using voice. And the strength meter is on zero. It should be showing the signal strength. (01:24:00)
Factual error: Rich told Jamie, "There was a car accident. Guy came in. I cut when I should've stitched or stitched when I should've cut. I don't even know. His family sued in civil court, and I lost everything." A doctor working at a hospital would have been required to carry malpractice insurance, which would have protected him from "losing everything." Also, it would be difficult to prove that a car accident victim who died during surgery was a victim of malpractice; most cases are settled out of court. (00:38:30)
Continuity mistake: Mikey and his friend are smoking the same inch-long joint by the back door which gets passed back and forth - no way they could keep holding/smoking it for that long given how short it was to start with. (00:04:50)
Other mistake: "Sally" the Great White Shark rammed Emma into a rock (or other hard object) underwater and Emma only got a small cut above her right elbow. It isn't clear how fast Sally was swimming, but Emma was rammed with force (and appeared to hit her back). A female Great White Shark weighs about 4,000 or 5,000 pounds, so Emma would be expected to suffer a major (not minor) injury under the circumstances. (00:05:24)
Character mistake: NYPD officers have their guns drawn toward the elevator in the Carrington Hotel. When the door opens, Borz, wearing an unbuttoned Carrington jacket - but not the hat or white gloves that the doormen wear - is told by an officer to "hold it" and states that he's "just a doorman." The officer backs up and allows Borz to leave. A police officer would not simply accept the word of anyone in this situation. The person would be handcuffed and detained until the situation is under control and the police determine he was not (or was) involved. (01:24:41 - 01:35:02)
Continuity mistake: The appearance of Grace's house by the front door (to the left of the screen) changes from the time Billy is standing along the road to when he meets his mother half-way. At first, the side of the house is mostly white; it is mostly brown thereafter. The garage area to Billy's left also changes color from brown to white. (00:05:22)