Dinosaurs on a Spaceship - S7-E3
Continuity mistake: At the end Amy and Rory receive a postcard from Siluria with the TARDIS pictured on it, but it is the old TARDIS from 2005 (note there is no St John's ambulance sign on it). (00:46:02)
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)
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.