Bonnie, I have to say, I agree with you about all of the possibilities of ghosts and other paranormal entities being recorded by movie crews, and they aren't filming anything that has to do with ghosts. They probably regard them as a nuisance, but never say anything about them, for fear that they will be ridiculed. I'll bet there are loads of ghost pictures on film that wind up on the cutting room floor (edited out), and they have probably done lots of retakes because of things like vortices, orbs, shadow ghosts, etc.. Just my thoughts....
azspirit