The following contains spoilers for Spider-Man: Far From Home**.**
Spider-Man: Far From Home is a movie with a lot of heavy lifting to do. It has to wrap up Phase 3 of the Marvel Cinematic Universe. It has to move Peter Parker into a new phase of his own life, and it also has to tell it's own story that is compelling and exciting. It largely succeeds in all of these efforts, but director Jon Watts says the entire movie comes down to a single scene that needs to work in order for the movie as a whole to be successful.
It's all about the conversation between Peter Parker and Quentin Beck that leads to the reveal of Beck's true intentions. The scene is the culmination of the movie up to that point and the jumping off point for everything that comes after. Interestingly, it's not because the director expects the reveal to be any big surprise for the audience. In fact, the director expects most viewers will suspect what's going on. According to Watts...
The movie hinges on that scene. It's a culmination of Mysterio's con. I anticipate that a lot of people will know that Mysterio is the villain, they aren't just exactly sure how or why.
The scene in question follows the battle between Mysterio and Spider-Man against one of the elemental creatures that has been causing damage throughout the world. Quentin Beck and Peter Parker have some down time in a bar and begin to really bond. Peter is questioning his ability to follow in the footsteps of Tony Stark as so many seem to be expecting him to do. Parker eventually talks himself out of the responsibility of the E.D.I.T.H. glasses, and turns over control of them to Beck.
It's at that point we discover that the bar has been almost entirely a holographic projection, an illusion created by Beck with the express purpose of getting control of E.D.I.T.H. from Peter. The only other actual people in the "bar" are part of Beck's team.
Jon Watts himself says that he wasn't sure the scene would work until he saw Tom Holland and Jake Gyllenhaal actually going through it. While there was only one version of the scene, it was worked on in the script phase continuously in order to get it right.
It's certainly true that the reveal of Mysterio as the villain isn't entirely unexpected. Fans of the Spider-Man comics who are familiar with the Mysterio character suspected from the beginning that he would end up being the villain and that everything he said would be a lie, that's sort of Mysterio's thing. Still, as Jon Watts says to Insider, even those who didn't know the history were likely guessing there was something more going on with him, but this moment finally shows exactly what is going on. .
It is a great scene. Spider-Man Far From Home is about the hero's struggles to be both Peter Parker and Spider-Man, and this scene makes that struggle feel real for the audience. It's a great moment in a great movie.