Goof (plot holes): The older and younger versions of Karzan come into physical contact with no ill effects. According to the "Blinovich Limitation Effect", such contact between two versions of the same person should result in a dangerous energy discharge.
Goof (revealing mistake): When The Doctor travels back in time to visit Kazran in his bedroom, the TARDIS is hidden behind two large doors, with the TARDIS windows clearly visible even when the doors are closed. When he does travel back, he appears in Kazran's recording, but you can still see the TARDIS's window between the doors.
Goof (continuity error): When the burglar is descending the hole in the roof is open. When going back up, the hole is closed.
Goof (continuity error): The number of the bus in England is W974 GHM, while the number of the damaged/CGI bus is RUA 461W.
Goof (revealing mistake): Although the desert planet has three suns, everything has one shadow.
Goof (continuity error): Three police vehicles are chasing the bus at the start of the episode: a Ford Mondeo estate, a Land Rover Discovery 3, and a Skoda Octavia. These vehicles chase the bus into the south entrance of the tunnel. However, the same three vehicles are then shown pulling up at the north entrance of the tunnel, forming the roadblock.
Goof (crew or equipment visible): When Lady Christine De Souza is going down the shaft in the aliens' ship to acquire the jewel, she is stopped by 'The Doctor.' When she resumes her descent, you can see a cable used to tip her over attached to her right boot heel.
Goof (revealing mistake): In the bedroom used by the Doctor, around the door damaged by the alien Christmas tree there are clear guide lines to help the carpenter cut out the tree shape.
Goof (revealing mistake): When they are explaining how the space probe carried blood samples, the camera pans down to show a computer screen, but a media player is shown. Later, the media player is shown full screen. The computer interface must have just been recorded onto a movie file and played, but they forgot to make it full screen before filming.
Goof (continuity error): After the doctor gets his hand cut off, he stands with his back to the clear skies. Then as he addresses the leader, he is shown with his back to the ship. And, without the leader moving, the Doctor then keeps addressing him with his back to the open skies again.
Goof (audio/visual unsynchronized): When the Doctor is proving his identity to Harriet Jones by telling her about when they were trapped together at Downing Street, his words don't match the movements of his jaw when we see him from behind.
Goof (plot holes): The Sycorax begin speaking English for all of the humans because the TARDIS is suddenly activated when the Doctor wakes up. However, it is stated elsewhere in the series that the TARDIS only translates for those who have been in the TARDIS, which Harriet hasn't.
Goof (continuity error): When the Unit soldiers aim at the controlled people, you can see that they have the same weapons as the guards on the game station in the 2001st century.
Goof (revealing mistake): The snow at the end of the episode, which is described by The Doctor as ash, can in some close-up shots clearly be seen as being foam.
Goof (plot holes): The "blood control" the Sycorax use to control the population has everyone with A+ blood walk to the rooftops or tallest building near them. How, then, are people in airplanes or those who live in generally flat areas of the world affected?
Goof (revealing mistake): During the long-shot of the Sycorax ship hovering above Rose's estate, the people standing on top of the buildings can be seen to be crude computer-generated images. Only five images are used and are repeated, and in several places overlap with each other, revealing their "flatness".
Goof (factual errors): When explaining information about Guinevere One there's a misspelling of the probe (Guinivere) twice.
Goof (continuity error): After the Master has asked the Doctor to listen to the drumbeats in his head, when he takes his hands away there is an obvious dirty thumbprint on the Doctor's left temple. When the camera next cuts back to the Doctor the thumbprint has vanished.
Goof (continuity error): The Master is repairing the computer and when he is done, 12 circles are shown. When the Doctor goes downstairs to where the aliens are, a screen shows only 7 circles.
Goof (revealing mistake): Significant and obvious differences between the dental structure of The Master between his real (actor) self and skeleton (generated) self.
Goof (revealing mistake): The internal view ports of the Vinvocci salvage vessel are hexagonal, while the outer computer generated view shows them as being rectangular with rounded corners.
Goof (revealing mistake): Donna's lottery ticket is rather a strange one in that the numbers are not printed in ascending order - 18 09 13 36 24, and the last one obscured by her fingers.
Goof (revealing mistake): When Jessica Hynes is autographing her grandmother's published "Journal of Impossible Things," it's clear that the marker she's using isn't writing on the page.
Goof (revealing mistake): As the TARDIS (balloon) is ready to take off the assistant starts releasing the tether ropes. Despite being buoyant, the last tether tied to the post is still hanging loosely.
Goof (revealing mistake): The wedding is suppose to be taking place on Christmas eve. Anyone who has been in London on Christmas eve knows it is cold, but everyone is dressed as if it is warm.
Goof (continuity error): When Donna and The Doctor are first running down the tunnel away from the TARDIS, the door is open but in the next scene it is closed.
Goof (revealing mistake): While the time-frame is set to be December in England, the trees in the background on the motorway chase are lush and green.
Goof (revealing mistake): When the Doctor is telling Adelaide about her granddaughter Susie Fontana Brooke, an internet information page showing Susie's accomplishments is shown. However, the names of Susie's exploration team are actually those of Adelaide's team.
Goof (factual errors): The news articles and obituaries shown on screen are dated "Thursday 22 November 2059". November 22nd will actually be a Saturday in 2059.
Goof (revealing mistake): Tarak Ital's name is misspelled as "Tarek Ital" in Yuri Kerenski's obituary.