Now that Star Wars: The Last Jedi is available on Blu-ray people have the chance to go over it very closely, and in doing so they're having fun with an apparent continuity error. The issue comes from the massive fight scene near the end of the film where Rey and Kylo Ren take down Supreme Leader Snoke's Praetorian Guard. Each member of the guard is armed with different weapons, but one of them starts the fight with a pair of knives, but one of them seems to vanish halfway through a skirmish with Rey. The hand has a blade when it disappears behind Rey's back, but when we see the hand again, it's empty.
While the public response to Star Wars: The Last Jedi has been mixed, there's little argument that this moment, revealed on Twitter, looks a little silly. It really does look, as the tweet points out, that the filmmakers realized after the fact that the guard could have just stabbed Rey in the back, and thus they removed the second knife. It's something you likely wouldn't notice on a single viewing in a theater with a fast-paced fight scene, but now that people have the chance to watch the movie multiple times, and watch frame by frame if they want to, the little things are getting noticed.
As you might expect, the internet is taking the opportunity to pile on.
There's already been a vocal contingent who have been extremely critical of Star Wars: The Last Jedi, and to them, this is just more evidence of the film's flaws.
While those who already had a problem with Star Wars: The Last Jedi are taking the opportunity to use this as more evidence of their issues. For others, the whole thing is just disappointing.
For those who had not noticed this moment previously. We're sorry, as, like watching a Stormtrooper bang his head in the original Star Wars: A New Hope, this is going to be one of those things you'll never be able to unsee. Every time you watch Star Wars: The Last Jedi from now on, you'll notice the vanishing knife.