Continuity mistake: Miss Kizlet wears a large silver brooch on her suit's right lapel in every shot of her, but after Clara notices the lights going out behind her house, when it cuts back to the office Kizlet's brooch switches to her left lapel just before it cuts back to the Doctor and Clara, and since the brooch has a distinctive design we can tell that it's a flipped shot. (00:25:11)
Visible crew/equipment: After Miss Kizlet enters her office to find the walking base station Doctor sitting at her desk, as she walks around the motorbike lying on the broken glass, when this 'Doctor' says, "Yes, those still with bodies to go home to would be free," we can see the moving reflection of two crew members on the surface of the motorbike.
Continuity mistake: When the Doctor and Clara are on the rooftop terrace, there's a distinctive design on the Doctor's bow tie, but when he's in the coffee shop the bow tie's design differs, and when he runs outside to ask if Clara's okay it changes back, then it changes again when he's in back the shop. Additionally, when the walking base station Doctor uploads Clara it's wearing a bow tie, and its design also changes on the motorbike and in Kizlet's office.
Continuity mistake: When Clara and the Doctor watch the lights going out, they first stand in front of the chair, but when the Doctor notes that some planes have WiFi, they stand behind the chair. That chair switches from in front of them to behind them another couple of times. (00:25:03)
Continuity mistake: While Clara shouts, "I don't know where I am," over and over, the Doctor sonics his way into the house. When he kneels beside Clara, then notices the 'girl' on the stairs and stands up, in the shots facing him we can see that the young actress stands on the step facing the stairway (note her legs), with her hand at her side, but in the shots facing the girl she stands facing the door with her hand on the banister. (00:15:22)
Factual error: Clara determines the location of the enemy's base of operations: floor 65 of The Shard. However, there are multiple issues with this conclusion. Firstly, floor 65 is a residential property, not an office location; offices in The Shard occupy floors 2 through 28. Secondly, the view of 30 St Mary Axe from Miss Kizlet's window puts the office below 180m, the height of the latter building. This would mean the office must be below floor 50. Finally, when the Doctor rides his motorcycle up the side of the building, 30 St Mary Axe is again seen, this time significantly below his location, and on the wrong side of The Shard. Not only then does the office's height change, but also which side of The Shard it is on. (00:36:06 - 00:38:40)
Continuity mistake: While the Doctor and Clara are talking and realise that she now possesses extensive computing knowledge, in shots facing the Doctor he has his hands raised in various gestures or by his mouth, but his hands aren't visible in shots facing Clara. (00:23:13)
Continuity mistake: When Clara asks the "girl" coming down the stairs if she's a friend of Angie's, and the "girl" replies in a monotone, in the shot facing Clara the girl-robot is seen nearly at the bottom of the steps, but in the next shot facing the "girl", she's suddenly higher up the stairs. (00:13:07)
Continuity mistake: When Clara is asleep in bed after the Doctor prevented her from being downloaded by the people in the Shard, he sets up a vase of flowers, a glass of water and a plate of Jammie Dodgers on her bedside table. The positions of the glass, the cookies on the plate, and the torn-open package the cookies came out of is seen when the Doctor leaves a half-eaten cookie on the plate in a close-up. When Clara wakes up, however, the cookies on the plate, the packaging and the glass have all changed positions. (00:19:20)
Continuity mistake: When the Doctor and Clara are sitting at their table on the balcony, talking, the level of Clara's mostly-finished milkshake changes several times, most noticeably when she and the Doctor are arguing over who is going to use her computer to hack the bad guys' systems. (00:31:00)
Continuity mistake: When the Doctor and Clara, while seated at their table on the balcony, are arguing over who has the better hacking skills while pulling her computer back and forth, in overhead shots their table is somewhere in the middle of the balcony. This contrasts with all other shots, which show their table right next to the railing. (00:31:16)