The Lazarus Experiment - S3-E6
Continuity mistake: When Francine calls Tish over to ask her if she's seen Martha and the Doctor anywhere, Leo is taking a drink from a nearly-empty glass of champagne. When Leo is next seen on camera, as Francine asks Tish if Martha had ever mentioned the Doctor to her before, he's drinking from a much fuller glass of champagne. (00:16:00)
The Lazarus Experiment - S3-E6
Continuity mistake: When the Doctor and Martha enter Lazarus' office, as the Doctor wonders where Lazarus is, in a wide shot he puts his hands in his pockets. In a close-up immediately afterwards, his hands are by his sides. (00:17:00)
Continuity mistake: When the Doctor fits the Chameleon Arch watch into the headset, his hands change position between shots. (00:20:15)
Daleks in Manhattan (1) - S3-E4
Continuity mistake: When Tallulah is reunited with Laszlo, she puts her hands on his shoulders. Then, between shots, they jump to his neck, then the collar of his jumpsuit, then his jaw, etc. (00:39:35)
Daleks in Manhattan (1) - S3-E4
Continuity mistake: Near the end, when Martha asks the Daleks what's going on and one of them explains that they are planning to evolve to live outside their shells, the Doctor changes position between shots while he's shown listening to this, standing behind Frank and Laszlo. (00:44:30)
Evolution of the Daleks (2) - S3-E5
Continuity mistake: When the hybrid Dalek Sec declares that the human prisoners in the lab will become like him, the Doctor is shown ducking out of the group to the side of the lab twice, in two successive shots. (00:01:15)
Evolution of the Daleks (2) - S3-E5
Continuity mistake: When Dalek Sec tells the Doctor, "The Cult of Skaro escaped your slaughter," the Doctor is lowering his chin. In the next shot, facing the Doctor, as he asks Sec how they survived, he still has his chin raised and head tilted back. (00:01:55)
Evolution of the Daleks (2) - S3-E5
Continuity mistake: After the Doctor slips Martha the psychic paper, when he and the Daleks leave, Martha is shown bringing her hand close to her body and opening the wallet with the paper. In the close up, she repeats the two actions. (00:12:05)
Daleks in Manhattan (1) - S3-E4
Continuity mistake: When the Doctor is taking the back off the radio, his grip on it changes between shots. (00:25:15)
Continuity mistake: After the Doctor gets directions to the motorway, when the red-haired female pharmacist leans over her counter to try and persuade him to buy some Happy, her hands change position between shots. (00:08:00)
Continuity mistake: When the Doctor, after being placed on hold while attempting to call the police, talks to Brannigan and Valerie about other people he could contact, in close-ups, Valerie has her right hand resting on the top of her seat. In a wide shot, she lowers her hand, but in the next close-up of her, it's jumped to its previous position. (00:14:20)
Continuity mistake: When Lilith runs her hand along the side of the Doctor's head to distract him so she can get some of his hair, in the wide shots her fingers are extended past his ear. In a shot facing him, however, her fingers are curled and in front of his ear. (00:34:40)
Continuity mistake: When the Doctor is persuading Shakespeare to come up with some words to stop the Carrionites with, in wide shots he has his right arm around Shakespeare's shoulder and is holding his left arm. In close-ups, they are not in physical contact. (00:38:35)
Continuity mistake: After Milo and Cheen abduct Martha, they put a sleep patch on her before entering their car. In the close-up where Cheen applies the patch, it's stuck on securely and neatly, with the top and bottom of the square pointing directly at Martha's head and chest respectively. In a wide shot immediately afterwards, the patch is stuck on quite loosely and has gone askew. (00:06:35)
Continuity mistake: When the Doctor puts his tie back on after returning from the morning, the collar of his shirt is noticeably askew as a result. Just moments later, when Martha enters the TARDIS for the first time, the collar is neat again, without him having done anything. (00:41:00)
Continuity mistake: When the Doctor first enters Shakespeare's room at the inn, the collar of his coat is askew. The scene cuts to Shakespeare, and when it cuts back to the Doctor his collar is now flat, without him having moved his hands from his pockets. (00:09:20)
Continuity mistake: When Lilith has Shakespeare under her spell and is having him write an alternate ending to his play, there is one shot of his face where his quill can be seen in the corner, perfectly still, even though the next shot shows that he's writing. (00:18:25)
Continuity mistake: When the Doctor, Martha and Shakespeare are in the Globe and they talk about the theatre's architecture, there is a wooden staircase in front of the stage, which Martha and Shakespeare use to descend from the stage when the three leave. Shortly after, at the beginning of the scene where the two actors from Shakespeare's company accidentally summon a Carrionite while practicing their lines, the staircase is gone. (00:22:10)
Continuity mistake: When Martha is talking to the Doctor, who is posing as a patient, about her encounter with him in the street earlier, which he doesn't remember, she takes her stethoscope off her neck. The camera cuts to the Doctor, then back to her, and she's taking it off again. (00:04:15)
Continuity mistake: When the Doctor is looking out the window while asking Martha if there's a balcony on the floor of the hospital they're on, in close-ups of him only his right hand is visible, resting on the sill between two windowpanes, and his left arm is by his side. In a wide shot from outside looking in, his left arm is stretched out with his left hand gripping the divider between two windowpanes, in a spot where it should have been visible in the preceding shot. (00:10:05)
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.