Continuity mistake: On the video of Ian supposedly killing Alison, we see her arm fall to the ground with her "Alison" bracelet visible. But in a later scene where Emily watches Ian put his bag in the athletics room, we cut back to the video and Alison's arm suddenly has a sleeve covering up her bracelet. When we see the video again later in the series, her bracelet is visible again.
Continuity mistake: Duke is wearing an extra shirt, and his hair is longer then it was, despite continuing the scene from the end of season 2.
Factual error: Scenes were obviously not filmed in London, more like New England. The vehicle registrations are the right colour, but wrong format.
Continuity mistake: Ava spills Coke on her blouse and creates a big circular stain. As she walks to the bathroom, the stain becomes a long narrow one. When she is leaving the pizza place, the stain is still narrow, but much shorter. (00:21:00 - 00:22:00)
Revealing mistake: Episode 15, "Faceoff": When the agent fires the hook to get to the roof of the church, it does not reach the balcony. However in a following shot you can see the agent climbing there. (00:10:05)
Continuity mistake: In the morning, Annie comes into the kitchen and says hi to her niece and nephew. Her jacket is alternately buttoned or unbuttoned. (00:39:30)
Plot hole: After Grant finishes her video confession, Latif puts the video recorder in his cargo pant pocket. A few scenes later, he's blown up without ever having taken the video camera out of his pocket. He was at the epicenter of the explosion and he and his clothes were very much on fire, which should have completely destroyed the video camera and its recording.
Continuity mistake: When Gary is at the end of the table talking about Golf, he's actually seated in front of the table as seen by how he grabs his cup in front of him. In the very next shot, he's no longer sitting in front of the table and is sitting past it.
Visible crew/equipment: In the final scene of the episode, a crew member in a plaid shirt is visible in the mirror behind Janet. (00:42:15)
Funny Money - S1-E10
Factual error: The characters travel to Cyprus where they are seen driving on the right hand side of the road, when in Cyprus they drive on the left.
Continuity mistake: In episode 3 or 4, one of the characters is knocked out and lying on the floor in the Russian sub. He is on the 'left' side of the shot most times he is shown, but occasionally he's on the right.
Continuity mistake: When the bomb under the bus is being defused, it's counting down and beeping once every second. We see the timer at 0:45, then cut to the face of the woman defusing it - counting the beeps when we cut back it should be on 0:45, but it's jumped up to 1:06. Camera pans down to her face, then back to the bomb, and it's now on 0:43, but going by the beeps it should be on 0:36. We cut away again for 5 more beeps, cut back and the bomb's only just ticking onto 0:41.