10 Doctor Who Mistakes You Can NEVER Unsee

10. Wrong Number (The Impossible Planet)

The Impossible Planet/The Satan Pit is a cracking story from Series 2, and it's very hard to find any major faults with it. But since we're here to nitpick and point out funny mistakes... here's one from the very end of the first episode.

When the Tenth Doctor and Ida are descending into the core of the so-called impossible planet, we're shown a screen that displays their oxygen levels, which continually deplete as they get lower and lower beneath the surface.

Or at least, they're supposed to continually deplete.

The oxygen percentage goes from 96 to 81, and then, a couple of shots later, from 40 to 31. So, you'd expect the next shot to be lower than 31, but for some reason, it bounces all the way back up to 45, before descending into the 30's all over again.

These numbers are quite in-your-face too, taking up most of the screen - it's not like they're off to the side on some tiny monitor - so the mistake is rather glaring.