“We had a read through last week in fact, so I know everything now... I cried at the end. You have to remember that eight years of it—no one really cares about it more than us,” he told BBC's The One Show.
Eight years of Game of Thrones, wow. That's longer than Hogwarts. that's as long as President Obama was in office. That's... it's just a really long time, you get it. “It’s been an institution longer than any other institution I’ve been in. School, drama school, anything. I get a bit weepy thinking about it. It’s going to be a strange year saying goodbye to everyone and having last scenes with this person and that person. Not only you’re attached to it, loads of people around the world are attached to it," Harington continued.
Of course, he couldn't reveal anything about what was actually in all of those emotional scenes. "[I was told], 'Don’t tell them you’re filming. Don’t take pictures in Belfast. Don’t do all of that,'" he explained. HBO is working so hard to keep Game of Thrones spoilers from leaking, in fact, that they're reportedly using earpieces to give actors their lines so that the scripts won't get out. It seems like a bit much until you remember that HBO has been hacked before. And then it still seems like a bit much, but it's more understandable.
Even after they wrap, the cast and crew might not know who wins the Game. Like other long-running shows, Game of Thrones will sometimes shoot multiple versions of the same story so that no one, from crew members to onlookers, can say for sure what happens until the episode actually airs. So maybe Kit read an alternate script! Hell, maybe there is no Westeros, and this is all just happening inside George R. R. Martin's snowglobe.