Plot hole: Nancy seems to have the unique ability to whistle with her fingers in her mouth - even though she's wearing gloves.

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.

Continuity: When The Doctor takes to the Nightclub stage to ask if anything has fallen from the sky, he has his right hand and arm up and gesticulating. But in several other shots of him from behind, it is his LEFT arm that is up and moving.