No question they were supernatural beings, but what does this have to do with what the OP asked? Are you suggesting that they were only visible to Howard and, thus, not to be seen on the video in the first place? That would make absolutely no sense. That way the p.i. would have told Howard's colleagues that there was nothing to edit out and Howard was truly talking to thin air. Meaning his colleagues would have known right then and there that the three are supernatural, way before the end of the movie. So yea, I call plot hole as well!
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