That Cracked link is weak. The Lost retcons are trivial compared to the others on the list as none of them really impact the story unless you pay too much attention to Damon Lindelof's (probably deliberately) confusing science quote. The reveal in Star Wars became the pivotal moment of not just the film, but the entire saga including the prequels. The X-Files mytharc is a mess of conflicting info, dropped storypoints and horrid clichés (especially towards the end). Twin Peaks was retconned on a daily basis (sometimes in good ways, most of the time in bad) as no one had an actual plan for anything, and it took less than 17 episodes to blow itself apart. (I'm not even going to go into the 24 mess, and I'm still on season one of BSG so I skipped that part to avoid spoilers.) Who cares whether or not David Fury knew everything. He did what he was told by Lindelof. None of the biggest story points of his episodes (Locke being in a wheelchair, for one) were even written by him. He was a dialogue writer, mostly, and in some cases not even that ("Don't tell me what I can't do" was written, uncredited, by Damon).
Sorry for the rant that follows:
To this day I've never understood the hate Lost generates. It's a mystery show that knew fairly well where it was going from pretty early on (most of the mythology was created during the first season), stayed consistent both mood-wise and story-wise pretty much from start to finish, and resolved every major mystery it presented. People can dislike the way it did it on story grounds - which is fine - but everyone is production anecdotes to make their point, as if that actually proves anything.
The fact is this: very little was made up as they went along. For a sci-fi/fantasy/insertgenrehybridhere mystery show spanning years of production and 121 episodes, it's remarkable how well planned it was. And yet, interestingly, the parts that were made up as they went along were often the BEST parts - like putting Henry Gale in charge of the Others, and Damon Lindelof's sudden idea that John Locke should be in a wheelchair prior to the crash. From people who aren't fixated on the "making things up as they went along" line, the creators got at least as much flak from planning too much (e.g. Frank Lapidus sticking around for years, doing virtually nothing, because he was supposed to play a part in the endgame).
In six years, there were probably two retcons (the whispers reveal; the numbers) and four change-of-plans moments (the leaving and coming back; Walt leaving the show because he grew up too fast; Adewale Akinnuoye-Agbaje leaving; and Nikki and Paolo being disliked). All of them except the whispers retcon were well-handled, imo. (For that matter, it's not even an explicit retcon.) Walt needing to be kidnapped because he got too big dovetailed nicely with Ben's manipulation, the Ana Lucia/Libby story and the introduction of the Others ("we're going to have to take the boy" still freaks me out), Adewale Akinnuoye-Agbaje quitting fit into the Smokey manipulation arc which tied into the next season with fake-Christian, and Nikki and Paolo were removed in a pretty interesting and macabre way once they unfortunately were on the show. Also, a minor probable retcon that actually helped the plot: the fact that DHARMA (in the 70s) used Room 23 to interrogate kidnapped Others. I love that. It puts the Purge in perspective.
To me, the whole show makes sense. I'm serious. Ask me anything.
PS: I love Neg's clip!