When agent Ellison is talking to Charley as he and his wife are leaving, he puts a Bible under his arm, then it goes to a shot from behind him where the Bible is missing, then it goes to another shot then back to a shot from behind where Ellison is putting the Bible under his arm again.
The device the guard at the power plant uses to scan badges is an inventory scanner. This device is only capable of reading bar codes and cannot read picture identification.
Following security protocols, Riley states on the phone that the date is 16 November. This episode occurs shortly after John's birthday, as established by the previous two episodes. A police cruiser computer readout in Terminator 2: Judgment Day gives John's date of birth as February 28, 1985.
When Derek is at Greenway's house, he sees that Greenway has supposedly hung himself. At the same time, he is on the phone with Sarah, who suspects that something is wrong with Greenway. She notices that the Greenway standing in front of her does not have the incision mark on his right arm that he showed her during their conversation in the bar. A brief flashback shows the incision mark, and then it cuts to Derek. The "real" Greenway is showed hanged, and does not have the incision mark either.
Near the end of this episode when Riley calls John on his cell phone, Riley hangs up and John's cell phone makes a dial tone sound. There are no dial tones on cell phones.
When Sarah enters the restricted area and walks up to the hazard suits, a crew member can be seen in shorts and striped shirt behind the chain link fence to the right.
In the alley where the time traveler appears, the awning of the local men's store lists a phone number with a 212 area code. This is the code for New York City (Manhattan) but the show is set in Los Angeles (downtown area code 213).
Sarah pronounces the Texas town name "Elgin" with a soft "g"; it's pronounced with a hard "g".
When Sarah tells Carl she's from Elgin, he recognizes it as being close to Corpus Christi. Elgin is actually just outside of Austin.
Sarah always stresses the need to destroy all parts of the terminators they kill so Skynet cannot use the advanced tech to build itself some day. But after Cameron kills the Greenway terminator she puts the exoskeleton's metal parts in a nuclear fuel waste drum and seals it, and later there is no indication they came back for the parts to destroy them. While it is unlikely someone would open the fuel drum this action goes against all Sarah's decisions in her previous dealings with dead terminator parts.