It's hard to believe that the first Deadpool movie changed the game in just 2016--so hard to believe, someone at Marvel Comics completely forgot about it, too. Luckily, the error was caught in time before printing Marvel Comics #1000 (but not without evidence).
With somebody making the false assumption that the first Deadpool movie was released all the way back in 2013, the mistaken history of Ryan Reynolds's superhero career made some major waves for Marvel's 8th years celebration. Since Marvel Comics #1000 devotes each page to a specific year, the mistake--and its solution--caused an avalanche of rewrites to occur.
As Bleeding Cool outlines, the eventual realization that Deadpool needed to be on the 2016 page, the short story by Derek Landy and Paco Medina was moved to its correct year. The result sees the published issue of Marvel Comics #1000 feature "2016 - The Deadpool movie is released." This replaced the original 2016 page which marked the year "Miles Morales migrates to the core Marvel Universe in Spider-Man #1."
Of course, the recent star of Spider-Man: Into the Spider-Verse couldn't be left out of Marvel Comics #1000, so he moved to 2011 where it was noted that "Miles Morales debuts in Ultimate Fallout #4." Fans might argue that year actually makes more sense... but what was on the 2011 page before it was replaced by Miles? Someone equally important to both the Marvel Comics Universe and Deadpool, strangely enough. The page marked the year "Cable returns to battle the Avengers in Avengers: X-Sanction #1." So Cable was moved to 2013, closing up the Deadpool error loop with "2013 - Cable returns to lead X-Force in Cable & X-Force #1."
Those weren't the only changes to Marvel Comics #1000 before publishing, with the cosmic entity called Eternity swapping places with Silver Surfer and Stan Lee's cameo in Guardians of the Galaxy Vol. 2. It's hard to believe that Marvel could actually forgot when the Merc with a Mouth debuted on the big screen, considering how massive a hit it turned out to be. Even harder when you consider how one small error like that could rewrite several pages of the entire Marvel Comics #1000. But as they say, it's better late than never. This could have been a much bigger mess for Marvel if the comic actually printed with the year error. Marvel Comics #1001 hits shelves on October 2, 2019 -- here's to hoping they get all the dates right the first time around with this one.
THE GREATEST TALENT EVER ASSEMBLED FOR ONE STORY! THIS IS THE BIG ONE! In celebration of Marvel’s 80th Anniversary, we have gathered together the greatest array of talent ever to be assembled between the covers of a single comic book! Names from the past, from the present, and even the future! Every page is filled with all-new work from this cavalcade of comic book luminaries! There is a mystery that threads throughout the Marvel Universe — one that has its origins in MARVEL COMICS #1 and which unites a disparate array of heroes and villains throughout the decades! What is the Eternity Mask, and who is responsible for the conspiracy to keep it hidden? And what new player will make their startling debut as these secrets are peeled away? Featuring the entirety of the Marvel Universe of characters!
Marvel Comics #1000 is available at your local comic shop, or directly from Marvel Comics.
Source: Bleeding Cool