During the making of Avengers: Infinity War, directors Joe and Anthony Russo entered a state of DEFCON 4 where they took no chances on spoilers leaking out. In the age of the Internet and Reddit, it's much easier for details of a highly anticipated movie to leak online, thus ruining the plot for those who wanted to remain in the dark until the theatrical release. One of the Russos' methods to counteract such an outcome was keeping the cast in the dark by knowingly spreading misinformation.
"We can divulge nothing at this point. We worked really hard to protect the secrets of the movie, because this is the end of 10 years of storytelling and I think a lot of people [have] emotionally invested quite a bit into the Marvel Universe, so we want to make sure they have the best experience they can have when they go in to see the movie," Joe Russo said during a conversation with Kinowetter. "We wrote fake pages for the script, we distributed fake pages. None of the actors have actually read the entire script, the real script. Very few people actually know what's going to happen in the movie."
This was a very smart move, because certain members of the cast, like Tom Holland, are notorious for not being able to keep secrets. The Spider-Man: Homecoming star "accidentally" revealed the first poster for Avengers: Infinity War on Instagram a day before the first trailer for the film dropped online, and has admitted in the past that he's terrible at keeping spoilers to himself, so the Russos were likely right in keeping the entire script to themselves.
Upon setting off for the film's press tour, the brothers also released a note saying that they'd only be screening select footage for journalists, and even then a certain level of secrecy should be maintained so fans everywhere can enjoy the experience when they see Infinity War in its entirety on April 27.
"We know there's a lot of very risible things that happen in the film, and it's hard, when you see it, not to talk about it, so we really wanted the whole world to be able to experience the film at the same time without it being tipped to what's happening in the movie," said Anthony. "We've been holding the film, we're going to screen it for the first time a couple days before it opens worldwide."
"We really feel like this is one that people need to see quickly before anybody spoils it for them," added Joe.
The directors also talked about the interesting interactions between Tony Stark and Stephen Strange. In one way, they're very similar, as they're both egotistical and self-confident, but at the same time they fall on different ends of the spectrum, because Tony is a man of science while Strange is one of magic.
When it comes to the movie's ultimate villain, Thanos (Josh Brolin), Anthony described him as "a son of a b----" and "the Genghis Khan of the universe."