What would you like to see?
For me I would love it if we get a scene from the movie, but from the eyes of an innocent bystander. Just imagine some guy getting a burger or something and a big ghost flies by, scaring the bejezus out of him and sliming him for good measure before exiting the screen, the ecto-1 drives by, shooting at the specter, we hear shouts and screams from the GB team trying to catch him, all the familiar sounds, but also of screen, and finally Slimer flies by, taking the guys burger.
What would you like to see ? The original crew? A sense of the story? A ghost or two?