Continuity mistake: When the Ghostbusters are heading for the building, there's a wide view of New York bathed in a sunset light with a red and blue sky. In further close-up shots, there is a clear sunny light everywhere. (01:15:20)
Continuity mistake: At the end of the movie when everyone is waving to the Ghostbusters and Ray is backing up the car, on the light bar on Ecto 1, the outer lens is a solid blue light bar. When the car goes to drive away, it's a clear light bar with blue lens covers over each individual rotator.