Harry Potter fans have been alerted to a blink-and-you'll-miss-it mistake in one scene from the popular film franchise - but it turns out it may in fact be an Easter egg hidden in the movie by the producers.
In the adaptation of J.K. Rowling's third book Harry Potter and the Prisoner of Azkaban, Harry is seen trying to sneak out of the school to get to Hogsmeade using an invisibility cloak.
His footprints in the snow are spotted by the Weasley twins, Fred and George, who drag Harry back inside explaining they have a better way of helping him go unnoticed.
The brothers introduce him to the Marauder's Map, a magical parchment showing Hogwarts, seven secret passages into the castle and the movement of people inside the school.
Read more on mirror.co.uk