Plot hole: In "Into Hell, Part 1", season 4, episode 7, the Unit discovers a soldier who they think is Betsy, tied to a chair. They note that the room is covered with PIRs or Passive Infrared Sensors. They then take out their night-vision goggles and begin counting the number of "infrared lines" they see. However, PIR sensors don't emit anything; they are passive. (00:23:15)klaser
Continuity mistake: Betsy rappels/climbs "first hand" because of a rope that seems to be anchored from the top, and is in a climbing brake or figure 8 rappelling device thus descending below her. But then it's visible that she's top secured by a knot, and when she sits, the rope is being recalled. (00:31:30)Marcus DH Ghavidel
Continuity mistake: As stated in another entry, Brown states that they are in a Huey when they are actually shown in a JetRanger. Later on, after twice showing night shots of a JetRanger flying overhead, they are shown in the cargo area of a Huey, then are shown flying and deploying out of a Huey. (00:04:30)Ian Hunt
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