Revealing mistake: When the little robot is pursuing the ghost dragon, there's a group of bystanders watching the filming. One of them, on the far left, wearing a white T-shirt, is even recording everything with his phone. Sure it could be part of the movie, but the man is taking a picture at the point where the camera and film goes team are not where the dragon is. (00:06:53)
Suggested correction: I mean, I think you could make a very compelling argument that, in the context of the film, those are simply people watching and recording the giant ghost-dragon flying around and the Ghostbusters chasing it.