The Bells of Saint John - S7-E8
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)
The Bells of Saint John - S7-E8
Continuity mistake: When the Doctor hands the scone to the waitress, her grip on it changes between shots. (00:33:00)
The Bells of Saint John - S7-E8
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: After the Doctor gets hit in the head by a football, when he raises his arms defensively when Ellie Oswald comes over to see if he's all right, his arms switch positions between the wide shot and the close-up. (00:02:02)
Continuity mistake: The leaf Clara feeds the Old God, which was the catalyst for her parents meeting and which she kept tucked in her book as "page 1", looks completely different to its first appearance in "The Bells of Saint John".
Continuity mistake: When the Doctor, being held by two of the crewmen, explains that there's a geographical anomaly the sub can land on to halt its descent, the hand of the crewman holding his right arm disappears in a close-up, followed by the crewman himself disappearing in the next shot. (00:04:57)
Continuity mistake: When Skaldak grabs Professor Grisenko's head and announces that Martian law decrees the destruction of the Earth, his hands change position on Grisenko's head between shots. (00:31:47)
Continuity mistake: The submarine surfaces among icebergs at the end. Just as the others go back into the submarine, the Doctor stays up there. Some snow goes onto his lip and his hair. In the following shot, we can see he isn't moving. But in the next shot, the snow on his hair and lip isn't there anymore. (00:40:00)
Continuity mistake: While Emma is explaining to Clara what an empathic psychic is, the Doctor grabs a bottle of milk from the table and takes a swig out of it, holding the bottle in his right hand, before jumping into the conversation to state that empaths are both extremely compassionate and extremely lonely. While he's saying this, his left hand goes from gesturing in a close-up to holding the milk bottle in a wide shot. (00:06:25)
Continuity mistake: When Clara draws the Doctor's attention to the vision of a forest appearing in the archway, the candelabra she is holding has two candles in it, with the third hole empty. Moments later, after the apparition has disappeared, there are now three candles in it. (00:15:30)
Continuity mistake: When Emma tells Clara not to trust the Doctor, the position of her hands and fingers, holding her teacup, change between shots. (00:19:00)
Continuity mistake: When the Doctor puts on a harness during the preparations to rescue Hila, a flap on the front keeps switching between being straight out and being folded behind the strap it's attached to. (00:29:25)
Continuity mistake: When Clara shakes the TARDIS' doors, demanding it let her in, her hands change position between shots. (00:36:25)
Continuity mistake: For most of the episode, there is a thunderstorm going on at Caliburn House. However, when the TARDIS is seen dematerializing and rematerializing when the Doctor and Clara go to take pictures of the ghost throughout time, it's dry in the grove where it was parked. The first time is especially noticeable, as moments later we are shown Professor Palmer and Emma looking through a rain-spattered window, commenting on the noise of the TARDIS' engines.
Journey to the Centre of the TARDIS - S7-E12
Continuity mistake: When Clara asks the Doctor if he's putting the TARDIS on basic mode because she's a girl and he responds "No!", his hand moves from raised to resting on the console between shots. (00:01:39)
Journey to the Centre of the TARDIS - S7-E12
Continuity mistake: Before they enter the damaged TARDIS, when the Doctor watches Gregor put down Bram, and then asks Tricky why he's using a blast suit and respirator despite being an android, his hands are clasped in front of his chest in close-ups, but down below his waist in wide shots. (00:09:15)
Journey to the Centre of the TARDIS - S7-E12
Continuity mistake: In the storage room, when Clara takes a model of the TARDIS down from a shelf, how she's holding it changes between shots. (00:12:10)
Journey to the Centre of the TARDIS - S7-E12
Continuity mistake: When the Doctor begins to explain to Gregor that the TARDIS doesn't actually have a self-destruct, he places his right hand on Gregor's shoulder. In the next shot, his right arm is by his side and he isn't touching Gregor. (00:26:00)
Journey to the Centre of the TARDIS - S7-E12
Continuity mistake: When Gregor hands Tricky the patch from his jumpsuit, Tricky's hold on the patch changes. In addition, the patch is sagging in shots facing Tricky, but not in the close-up of it. (00:32:40)
Journey to the Centre of the TARDIS - S7-E12
Continuity mistake: Near the end, when the Doctor picks up the remote control and reads the words written on it, the position of his hands as he's holding the device changes between the close-up and the wide shot. (00:43:40)
Chosen answer: 1) When Stephen Moffat took over he ignored a lot of what had been developed before (there is not in-universe answer). 2) It would have killed Rose, so the Doctor absorbed the energy. His body regenerated before the energy could do a significant amount of damage that would prevent regeneration.