Corrected entry: Why did the Gatekeeper and Keymaster (the dogs) have to possess Dana and Louis? From everything we see, the dog statues are at the top of the building, and the demon dogs break through. Then they go and destroy half the building to find people to possess. They wait a while, Louis gets taken to the Ghostbusters, and Dana stays in her apartment. Then even later they go back to the top of the building, and stand exactly where they were standing after changing from the statues where the lightning changes them back into the demon dogs. What was the point of them leaving, possessing people, then coming back?
Corrected entry: In the ballroom scene, when Egon shoots the cake, it explodes seconds before the proton beam touches it. (00:36:10)
Corrected entry: How could Egon get down to the ground floor so quickly? I mean, a few moments earlier, he poked a guest in the shoulder. And, why would he go back down to the first floor in the first place? They said that nothing happened on any floor except the twelfth.
Corrected entry: When Dana tells Peter of the refrigerator incident, Peter opens the door to investigate. On the top shelf is a can of Coke with the label "Coke" clearly displayed. Just a moment later, he double checks the fridge, where the can now reads "coca-cola." Somebody turned the can between shots.