I can't and won't definitively say it was a, "ghost," but that would certainly be the easiest explanation.
I do believe that just as some people seem to have pre-cognitive abilities, seeing events before they occur, some people may have post-cognitive insights that could reveal some after image of events that had already taken place.
Last year a new TV series started called "The Holzer Files." His daughter Alexandra appears on it, and each week they revisit a place that her father previously investigated. Holzer had two mediums he relied on when visiting these places. One was the British Medium Sybil Leek, and the other was Ethel Johnson-Meyers. They were the two who featured prominently in his books. He recorded every investigation he conducted, and I believe he also filmed some, and took photographs. The episodes that have been featured on the show, I remember reading about those same investigations in his books. The second season of the program started last night.
I had a “haunting” experience that lasted over a month, either a fit of temporary insanity or a bonafide Demonic assault. I heard shouts from downstairs when upstairs and heard shouts from upstairs when downstairs, saw objects move on their own, woke up feeling someone caressing my hair or pulling the blanket off of me, and finally climaxed by getting grabbed while in bed by an unseen, growling/hissing foe.
A prayer sent it off and stopped all the other phenomena in the house.