10 Hilarious Doctor Who Mistakes You Definitely Didn't Notice

10. Big Ben's Gone Wibbly (Aliens Of London)

In the early years of the 2005 revival, Doctor Who was knocking out 14 episodes per year, quite a feat considering how much work went into each one.

With a single episode potentially taking two weeks to shoot, that's half a year of pure filming, not even factoring in the writing, special effects work, scoring, and promotion. It was an absolutely hectic schedule, so it's no surprise that there were miscommunications from time to time.

One such miscommunication led to this odd mistake in Series 1's Aliens of London, with a shot of Big Ben's clock face - which is then shattered by the wing of a spaceship - having been flipped so that the numbers are on the wrong side.

In behind-the-scenes footage (below), Mike Tucker - who oversaw the model work for the episode - explains that his team was initially told that the left wing of the ship would smash through the clock, so that's how they filmed it. But during post-production, this was changed to the right wing, so the shot had to be flipped.

On the plus side, this moment is so fast that it's not a blindingly obvious gaffe. Even Tucker himself admits he didn't notice it until one of his repeat viewings!