Continuity mistake: All shots of the Jeep Cherokee prior to it crashing (and during the process of flipping over) show that it wears factory-optional silver steel wheels of a 'star' style. But as the wreck settles upside-down, it's wearing plain steel wheels (like those found under full wheel covers or on a spare tire).
Continuity mistake: When John and Pyle are at the shooting range, John's protective glasses are up on his head when he fixes Pyle's gun, down on his face when he fires the gun, back up on his head after firing and then back down on his face when he gives the gun back to Pyle. They're then back on his head before taking them off before the scene ends. (00:13:45)
Continuity mistake: Season 2, Episode 5: "Goodbye To All That" - We see Marty Bedell playing on his Xbox 360 with a headset attached to his right ear. But when the T-888 arrives at his house to kill him and he goes to answer the door, the headset is gone. There was absolutely no time for Marty to remove the headset as the camera cuts too quickly.
Continuity mistake: Throughout most of the episode, the repeated conversations seen in each character's stories are slightly different to each other: the way certain lines are delivered, the position of the actors, etc. These scenes were most likely re-filmed.
Continuity mistake: Season 2, Episode 18: "Today Is The Day, Part 1" - At the beginning of the episode, Jesse hasn't gotten rid of Riley's body yet but has somehow found the time to replace her living room table which was broken in the previous episode, "Ourselves Alone", whilst fighting with Riley.
Continuity mistake: *Season 2, Episode 21: "Adam Raised a Cain" - When James Ellison leaves the elevator after talking to Catherine Weaver, Catherine's fringe has changed from its original position. At first it was diagonally across her forehead, but when James leaves the elevator, it is swept back.
Continuity mistake: Season 2, Episode 21: "Adam Raised a Cain" - When the water delivery Terminator kills Debbie by shooting her in the head, there is no visible entry wound. But later when Derek finds her body, there is a bullet hole suddenly in the middle of her forehead.