The first episode of a series — also known as a pilot — is key, since it can decide whether the show will go on air or not. Occasionally, the pilot is so good that it is aired as it was filmed, whereas other times it is filmed all over again. But it can also happen that the series later takes a very different path from what its creators had originally conceived when shooting the pilot. And the most ardent fans later notice some inconsistencies.
Web Source: BrightSide
