The cast — which includes Logan Lerman and Ezra Miller — all bonded while living in the same hotel in Pittsburgh, which Watson now calls one of her favorite places. It was there that Watson can point to one particular scene — when Sam stands up in the back of a pickup truck driving through a tunnel — as the moment she was able to truly graduate from Hogwarts. “I started as Emma with some Hermione still left in my system,” she says. “I went through the tunnel and I came out ready to start something new.”
You can see a bit of the scene in the movie trailer. I can't tell how important the location is to the film. But this could be the one that drives migration.