The clock tower on Big Ben appears to keep running even after being struck by the spaceship.
The number Jackie calls has 11 digits but she only dials 9 and when she redials it only has 4.
When Jackie has called the police to her flat the Doctor alternates between shots, sometimes having his hands in his pockets, other times having his arms crossed.
When the Doctor and Dr. Sato are looking over the body of the Pig Mutant, the chest can be seen rising and falling.
The close-up shots of the Palace of Westminster clock tower (a.k.a. "Big Ben"), as it is destroyed by an alien ship crashing into it, show the clock faces back-to-front. This is because the director wanted the ship to move across the frame the other way.
When the Doctor is kneeling over the Slitheen's engineered Pig Mutant, the seam of the plastic mold of the costume is clearly seen.
When Rose enters the TARDIS after the Doctor returns from the hospital, the Powell Estate is clearly not outside the door; it is simply a black background.
In one close-up of a photographer taking pictures outside 10 Downing Street the scene is reversed to provide an opposite angle. You can see the "Nikon" nameplate is reversed on the front of the camera.
The alien is taken to Albion Hospital on the grounds that it's the nearest hospital to the crash site, however the body is shown being recovered from the Thames beside the London Eye, meters away from St Thomas' hospital.
At about 33:30, Indra says that they have software that automatically searches communications using keywords; however, at about 30:00 when Jackie calls the hot line, the keyword searches are shown being manually typed.
The shadow of the cameraman is visible on the wall then on Dr. Sato's back as Dr. Sato approaches the storage cooler to investigate the banging noise.