Episode Quotes

Mistakes/Goofs

• Goof (factual errors): The reference to the UK needing special "secret launch codes" from the UN is a compete fiction. The UK could launch a nuclear strike without needing permission from the UN.
• Goof (factual errors): The weapons override screen of the HMS Taurean shows 8 tubes for weapons. The Trafalgar class has only 5 torpedo tubes.
• Goof (factual errors): Mickey identifies the HMS Taurean as a Trafalgar class submarine. The weapons selection screen shows that the sub is carrying Polaris and Trident ballistic missiles. The Trafalgar class is an attack submarine, designed to hunt and kill other submarines. It would not be carrying ballistic missiles as part of its weapons load.
• Goof (revealing mistake): When the boy is cleaning off the graffiti on the TARDIS, he opens the door and you can clearly see the glass windows from the inside.
• Goof (revealing mistake): Obvious disparity between CGI Slitheen creatures and the live action during chase scenes - the monsters moving at far faster speed than their quarry, yet repeatedly repositioned a considerable distance behind again in subsequent shots with the full-size (and different-colour) monster costumes.

Trivia

• When a Slitheen visits Mickey's flat, the word "Salford" can be seen graffitied on the wall near the elevator. Christopher Eccleston's hometown is Salford.
• A working title for this episode was "10 Downing Street".
• This episode was watched by 7.98 million viewers on its original transmission, winning a 40.15% audience share.
• When the Doctor and Harriet Jones are in a room (and giving instructions to Jackie and Micky via the phone), Harriet Jones, in a fit of frustration, yells at the Doctor; 'you're supposed to be the expert, think of something.' This is very similar to what Sky Silvestry says to the 10th Doctor in Midnight, when the banging outside gets louder. She yells in frustration at the Doctor; 'you're supposed to be the expert, do something.'