Revealing mistake: When Diana blasts Lydia's shuttle, there is an explosion but the craft is still visible and intact for a brief second. (00:45:20)
Deliberate mistake: Several shots have been taken from Series 1, including the group of guards firing in the hangar bay, and various shots of the shuttles during the chase.
Continuity mistake: When Elizabeth is pricked by the rose, there is a closeup of her bleeding finger. Before and after this shot Kyle is holding her hand, but not in the closeup. (00:03:25)
Audio problem: At the start of Nathan Bates' angry rant, he says 'What do you mean, another van of children got through the border?' and it has obviously been dubbed as it sounds different from his following lines. My guess is that he swore originally, and it was taken out by the producers at the last minute. (00:06:05)
Audio problem: When Mike and Ham arrive at the church, their lines have been badly dubbed as Mike is still supposedly talking to Ham as he gets out and shuts the van door. (00:06:50)
Deliberate mistake: The shot of the cocoon gestating is taken from episode 2. This is evident because there is sand underneath it and rocks in the background, but when the tracker finds it later, there are no rocks and sand in the tunnel. (00:25:30)
Audio problem: When Julie walks into Nathan Bates' office and says 'I've got a question for you' her lips do not match what is heard. (00:33:55)
Revealing mistake: The two Elizabeths are both played by the same actress, except in the shots where both are seen together. Continuity mistakes in the second Elizabeth's death scene reveal this, such as the second Elizabeth's head position changing, and the first Elizabeth's jacket being open/closed between shots. (00:42:30)
Deliberate mistake: The shot of the mothership landing bay and the arrival of Charles' ship is stock footage that has been used several times before. There is also a continuity error here - the view from the landing bay shows darkness outside, but the next shot shows broad daylight. (00:06:20)
Continuity mistake: When Chris and Ham are sitting down talking about The Conversion process, Ham gets up and walks over to the map. When he turns around Chris is suddenly standing in front of him, whereas he should still be sitting down. (00:37:35)
Revealing mistake: Several times during the Charles v Mike fight scene it is obvious that Charles has been replaced by a stunt double. (00:43:50)
Deliberate mistake: The shot of Willy running away from the parked car is taken from the episode where Elias is killed. Two things give this away - 1) Willy is wearing a different coloured jacket and 2) he is supposed to be seriously injured yet he sprints along the street. (00:08:50)
Continuity mistake: When Charles reads the message about Nathan Bates coming out of the coma, there are two things to look for during the closeup of the note. The logo on the top is replaced by writing and he grips the note in a different position from before. The writing changes yet again when the note is seen from behind. (00:13:35)
Audio problem: When Ham grabs Howie's armband and says 'our man' it's painfully obvious that the words have been dubbed by Marc Singer instead of Michael Ironside. (00:19:00)
Revealing mistake: When John is holding the two mice, if you watch his left arm closely you can see his arm jerk beneath the table where he replaces the real mouse with an edible one. (00:20:50)
Continuity mistake: When Willie dies, Howie says 'he's gone' but Willie's head position changes between shots. (00:24:55)
The Rescue - S2-E13
Visible crew/equipment: The boom mike is visible at the top of the screen shortly after James starts talking to Diana in the mothership control room. (00:04:05)
Plot hole: In the opening scene we see Mike and Kyle driving in the truck. Kyle remarks that Mike has been driving since midnight and it is broad daylight outside. So they have supposedly been driving for several hours. Yet they start talking about their mission as if they have only just got in to the truck. As anyone who has been in that kind of situation knows, everyone always discusses the important stuff at the start of the journey, so it is clear that the scene has been poorly scripted. (00:02:00)
Revealing mistake: An obvious stunt double replaces Marc Singer when he kicks the sheriff's shotgun out of his hand, and also when the truck drives into the lake. (00:05:10)