Try discussing the science of the Ghostbusters, like the technology and how it works. For example explain exactly how a proton beam would wrap around a ghost. I've had friends slap me before because I just jept going on about the science of it. I could probably fill 3 or 4 pages on the science alone.
You could also write a short backround for each of the main cast members. Also discuss how it really started out (Dan Aykroyd and John Belushi running through time and space catching ghosts). Do not forget to at least mention Ghostbusters III, like the rumored plotlines, why it hasn't been made yet and statements that Sony has made. And you could always include some of your experiences as I ghosthead (what got you interested, why you love it so much, etc.)Good luck!