8 Movie Mistakes Acknowledged As Canon

8. The Clumsy Stormtrooper - Star Wars: A New Hope

Star Wars: A New Hope plays host to one of the most infamous - and glorious! - gaffes in cinema history, when an ill-sighted stormtrooper smacks his head on one of the Death Star's doors.

The moment has been relentlessly relished by fans ever since the film's original 1977 release.

According to the man behind the helmet, the mistake happened because he was preoccupied with a bout of intestinal trouble during shooting, yet neither George Lucas nor any other crew member apparently noticed the comical error.

And though Lucas can be a rather humourless sort where mockery of his baby is concerned - and honestly, can you blame him? - in this instance he decided to lean into the absurdity and make the mistake even more apparent for A New Hope's 2004 re-issue.

Lucas added a distinctive metallic "donk" sound effect to the helmet's impact, ensuring practically nobody watching could miss it while giving everyone another big laugh in the process.

Lucas further toyed with fans by also including an overt reference to the injury in 2002's Attack of the Clones, where Jango Fett (Temuera Morrison) hits his own head on the door of his ship, Slave I, while escaping Obi-Wan (Ewan McGregor).

Given that a good portion of the first-generation stormtroopers are cloned from Jango himself, Lucas has basically made that lunk-headed clumsiness a damn genetic character trait.