Director Ivan Reitman performed the demonic voice of Dana/Zuul in the bedroom scene with Peter Venkman. See more...
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Continuity: At about the middle of the film, when the Ghostbusters are rising to fame and are appearing on the front of newspapers and magazines, the photograph on the front of the New York Post is taken from the end of the film, just before the four of them cross the streams from their proton packs.
Revealing: In the ballroom scene, when Slimer is flying around the chandelier, he disappears for a few frames when he reaches the far side. [This animation is mentioned in the DVD commentary. The film makers were generally unhappy with the entire animation and the fact that the representation of the apparition did not resemble those previous and that the movement was very unconvincing.]
Continuity: When the guys blast the glass lamp in the hotel, it falls on a table and messes up the table and chairs around. In the following angle the chairs are in a different position and the area, which was dark half a second ago is now perfectly lit, without anyone having moved and, most important of all, after the big lamp has been shred to pieces.
Revealing: Near the end of the film when the Ghostbusters take cover in a small corner and come up with the "cross the streams" plan, look closely at Peter's proton pack, you can see that it is a foam "stunt" pack as there is a small sticking out part that keeps squashing against the wall behind him.