Chris McKenna and Erik Sommers are quickly becoming another “in-house” Marvel Studios writing duo much like Markus and McFeely. They’ve written three MCU movies (Spider-Man: Homecoming, Ant-Man and The Wasp, and Spider-Man: Far From Home), and it seems like they’ll be around for a while.
In an interview about writing Far From Home with The Hollywood Reporter, they reveal that Hope was originally going to have a lost cat in Ant-Man in the Wasp that would setup Avengers: Endgame:
Chris McKenna: We were working on Ant-Man and the Wasp and then we were told, “Hey you guys need to put a line in there about Hope [Evangeline Lilly] losing her cat,” at some point, because they were trying to set up something in Endgame. In Endgame, a rat crawls in the van and sets up the Quantum Tunnel and that’s how Scott gets ejected. I’m guessing maybe it was going to be Hope’s cat, who was stuck in the Quantum Realm, somehow comes out. But I’m totally guessing, I have no idea.
Erik Sommars: There was something that was going to happen with her cat, “so you have to put this cat in.” That was just something that was on the board and we were going to do. After a couple of months, then it was, “No, we’ve moved on. We’re going to do this other thing so don’t worry about the cat anymore.”
Things like this change all the time with Marvel Studios films, one idea is floated that would set something up and then changed or abandoned, but this gives people a good idea how far out they’re laying seeds to setup future events. They were told about the Quantum Realm very early according to the interview, due to its importance in Avengers: Endgame.
That makes you wonder what breadcrumbs were put in Spider-Man: Far From Home that will play out in Phase 4…