Deliberate mistake: The final Auton attack in this episode is supposed to take place in a busy London street, but it is a pedestrianised area, and several shots reveal this. For example, there are no road markings visible, no apparent distinction between pavement and road, and a bus stop appears to sit in the middle of the 'road'.
Deliberate mistake: During the scene where Jack is scanning the gas mask people, he has a scanner on his right wrist. However, when he shows Rose and The Doctor his image of the Tula warship, the scanner is on his left wrist. The makers flipped the stretch of film, according to the commentary, to make the shot work.
Deliberate mistake: When the Doctor visits all his recent companions before he dies, he goes to a book signing of "The Journal of Impossible Things" written by Joan Redfern's great grandchild. When she is signing the book for the Doctor, you can hear the scratching effect from the pen but you can clearly see that the pen isn't touching the paper.
Add timeProfessor Lazarus