Revealing mistake: When the movie starts, Carl and Sam exit the subway station. A few members of the public/extras/background can't help but stare at the camera during the time it pans past them, firstly the man at the back as they are arriving up from the stairs, then the man with a hat, then the truck unloader on the right of the screen before they look at the red car. They all either seem to be starting at the camera, or looking or for thier cues to start acting.
Sacha
22nd Feb 2017