Far From Home's ending sees Peter swinging through Manhattan on his way to meet MJ. We then cut to the credits before the mid-credits scene kicks in.
Peter and MJ land in the middle of the city, and suddenly we hear a radio broadcast... no, we realize, it's actually a video broadcast as J.K. Simmons appears on a giant screen mounted on a building. Yep, the actor who played J. Jonah Jameson in the first three Spider-Man movies is back as the character again, and he reveals in this broadcast altered footage of Spider-Man's final battle with Mysterio which indicates that Spidey was the cause of the attack.
And not just that, but footage of Mysterio sees the villain exposing Peter Parker's true identity to the world... right before the movie cuts to the rest of the credits!
— Jacob Hendricks (@JacobHe19953790) July 3, 2019