Spoilers are a major concern for Star Wars fans who want to make it to Star Wars: The Last Jedi with a minimum of information about what the film is even about. However, Mark Hamill used that fact to have a bit of fun at the expense of the overzealous. Over the weekend, the actor told his Twitter followers to stay away from a particular comic book that he claimed would spoil the new film. The comic book in question is, in fact, called The Last Jedi, but the truth is that Hamill is just messing around.
Issue #49 of the original run of the Star Wars comic book does share a title with the next movie in the saga, but we're fairly certain that's the only thing the two have in common. The book was written in 1981 and deals with Luke Skywalker and Princess Leia answering a distress call to find a ship that's crash-landed, including a survivor who is a potential Jedi. The issue was written prior to Star Wars: The Return of the Jedi, nevermind the current trilogy, so if you really want to read it, and you can find it, you're safe from spoilers.
The vast majority of people took the tweet as the joke it was meant to be, though some reportedly reacted as if Mark Hamill was serious. To be fair, Hamill has absolutely made comments in the past about things that people should avoid reading about Star Wars: The Last Jedi if they don't want spoilers. Those legitimate comments are written in much the same way that this tweet was, so if you didn't look too closely at what he was referring to, you might just assume he was serious.
If you weren't certain, however, Mark Hamill followed up later in another tweet, confirming that it was a joke. Rian Johnson isn't the sort of guy to take inspiration from a random comic book, in case you were worried about such things.
Hilarious! If anyone thinks Rian used plot-points from an 80's #SW comic book doesn't know @rianjohnson! #WaitForVIII
Needless to say, what little we know about Star Wars: The Last Jedi doesn't match with the plot of the comic book, so we can all rest easy. Rian Johnson did not borrow plot points from a 1980s comic book for his screenplay. Besides, that comic book isn't canon anyway, so it's basically like it never happened.