20 Things You Somehow Missed In Ghostbusters
10. There Is No Dana, Only Ivan
Speaking of director Ivan Reitman, he is uncredited for two different appearances in the final film.
What, you thought that was Sigourney Weaver's voice? Whilst she did apparently climb on a table and bark like a dog in her audition to show how badly she wanted the part, the classic "there is only Dana, only Zuul" line was actually performed by Reitman.
He also plays the loveable blob of ectoplasm Slimer. All the grunts and wheezes that the class 5 full roaming vapour makes are actually the film's director.
Considering how instrumental in the film's success he was, it's nice to that the now late Reitman is captured forever both off and on screen in these classic scenes.