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: 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)
The Bells of Saint John - S7-E8
Continuity mistake: When the Doctor tells Clara he's not going to budge from his spot, he puts his sonic screwdriver inside his jacket. After she responds that she'll just come to him, he's holding it out again. (00:21:32)
The Snowmen - S7-E7
Continuity mistake: When the Intelligence in Simeon's body is attacking the Doctor, the Doctor's left arm goes from pushing at Simeon's right shoulder to suddenly stretched along the floor in a shot from above. (00:54:48)
The Angels Take Manhattan - S7-E6
Continuity mistake: When Amy and Rory are arguing after he puts her left hand to his chest and she grabs his shirt, in close-ups of her, she has her right arm raised instead. (00:36:00)
The Angels Take Manhattan - S7-E6
Continuity mistake: When the Doctor comments on Amy and Rory kissing in public before Rory leaves to get coffee, he goes from holding his book in his lap to reading it and back between shots. (00:08:15)
The Snowmen - S7-E7
Continuity mistake: When Clara tests the solidity of the cloud the TARDIS is parked on, her right hand suddenly jumps to the railing of the staircase between shots. (00:18:14)
The Bells of Saint John - S7-E8
Continuity mistake: When Clara is talking to Mr. Maitland as he prepares to leave, the cordless phone she's holding switches hands. (00:05:38)
The Snowmen - S7-E7
Continuity mistake: When the Doctor offers Clara a TARDIS key, he's holding it differently between shots. (00:44:35)
Continuity mistake: After the Doctor reprograms the cubes, when he tells Amy and Rory that a massive energy wave is about to go through the spaceship, his right hand, holding the sonic, goes from raised to lowered. (00:39:20)
Continuity mistake: When the Doctor is telling Amy and Rory how he's going to reprogram the cubes, the sonic screwdriver disappears from his hand. (00:38:50)
Continuity mistake: When the Doctor is in the containment unit with a cube during the countdown, there's a shot from outside where another cube in another containment unit is in the background, not displaying the countdown that all of the cubes are supposed to be showing. (00:29:03)
Continuity mistake: As the Doctor is saying "Pudding, but savoury: sound familiar?", the fish finger he's holding suddenly has less custard on it between shots. (00:16:25)
Continuity mistake: The scene where the Doctor forces Jex over the boundary line starts off in roughly mid-afternoon lighting, but when the Gunslinger arrives and Isaac is shot, the sunlight is at a much lower angle. (00:25:35)
Continuity mistake: When Amy and the Doctor are arguing over whether Jex should be punished, her hair is blowing a lot in shots facing him, but very little in shots facing her. (00:24:10)
Dinosaurs on a Spaceship - S7-E3
Continuity mistake: After Rory and Brian are sitting in the control chairs, when the Doctor makes a Silurian joke and then gripes that no-one found it funny, Brian's hands move to the buttons on the end of the armrests instantaneously between shots. (00:39:20)
Dinosaurs on a Spaceship - S7-E3
Continuity mistake: When the Doctor notices Brian and starts questioning him on how he got aboard, he's shining his flashlight into his face, but then the light is gone in a close-up of Brian. (00:03:01)
Continuity mistake: When the Doctor reaches up to touch the face of the woman he's meeting, his left hand, with which he'd just grabbed the woman's hand in the previous shot, is by his side, only for him to be holding her hand again in the next shot. (00:01:57)
Continuity mistake: When Rory pulls out his torch and starts looking around, it switches hands between shots. (00:17:43)
The Doctor, the Widow and the Wardrobe - S7-E1
Continuity mistake: When the Doctor asks the wooden people to show the Arwells where the timeship is going, the queen raises her hand, widening the window's field of view. In a shot shortly after focusing on the Doctor, the queen's hand is lowered in the background, before suddenly being raised again. (00:48:57)
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.