Factual error: In the 2008 Christmas special, Shean fell through the ice on a frozen lake. The water would have been jet black once below the surface, and the water temperature, just above zero, would have meant near instant muscle spasms followed by muscle paralysis, making swimming around and holding your breath completely impossible.
Other mistake: 14/07/11 - During Christian and Zainab's confrontation at Christian and Syed's flat, Christian is trying to gain Z's approval for his and Syed's adoption application. Throughout the entire 10 minute scene, the camera can be seen wobbling from side to side, as though all cast and crew are on the Titanic. The BBC even received complaints from viewers, stating that they had to turn the scene off because the camera angles were making them feel seasick.