Eagle eyed Harry Potter fans have spotted a major production mistake in The Chamber of Secrets.

In the second film of the franchise, wizarding fans have noticed an error that made it into the final edit. In a Harry Potter thread on Reddit, one person posted a screenshot from the scene where Draco Malfoy and Harry Potter are set a duelling task by Professor Snape.

As Draco gets knocked over, there is a cameraman in shot, just to the left of the screen.

One fan said they would never have noticed if it hadn't been pointed out while another admitted they had spotted a few mistake Chamber of Secrets.

Eagle-eyed Harry Potter fans often discuss theories, sub-plots and other topics relating to the series. Theories are a hot topic of conversation, with many making their own - and often plausible - ideas up.

For example, there's one theory about Ron Weasley that most fans seem to agree on.

But a lot of the time, many Potter devotees often argue with one another about possible theories.

For example, there's another idea that Harry never left the cupboard under the stairs and instead made the entire Hogwarts world up.

This theory riles quite a lot of people up who aren't a fan of 'and it was all a dream' idea. In this case, this theory is just a theory as J.K. Rowling never confirmed it herself, but fans still discuss it to this day.

While one that's definitely not plausible, but would still be a nice theory is that George Weasley is actually Willy Wonka.