10 Changes Doctor Who Hoped You Wouldn't Notice

It goes without saying that each series of Doctor Who is meticulously planned in advance - but still, even the best laid plans are subject to change.

One unusual way that this has happened in Doctor Who is when the episode order is shuffled around just prior to broadcast. This has been done a few times over the years, and despite the BBC's best efforts to conceal these switch-ups by adding or removing scenes, some of them are easy to spot if you pay close attention.

An example of this can be found in Series 6. Episode 9 - Night Terrors - was originally meant to air near the start of the series, but when this block of episodes was deemed "too dark", it was pushed to the back half of the series instead.

This change is mostly unnoticeable, save for a quick line near the end of the episode - a line which foreshadows something that's already happened.

After Amy's peg doll transformation is reversed and the Doctor reunites with her (and Rory), he notes that it's good to be back together "in the flesh". Had Night Terrors kept its original, early-series episode slot, this line would've foreshadowed the fact that Amy is a Flesh duplicate, but as it stands, this plot thread was resolved in episode seven - two episodes earlier than Night Terrors ended up airing.

The classic series was also not immune to these broadcast switch-ups. Seventh Doctor serial The Curse Of Fenric was supposed to air earlier in its season, but due to its dark tone, it was pushed back to coincide with Halloween.

This is another change that's mostly unnoticeable, save for the fact that the "big reveal" of the Doctor's new brown jacket had zero impact, because it had already been seen in a previous serial.