Einstein believed that all time exists simultaneously, which could possibly explain your observations. I feel it is a possible explanation for ghosts, UFOs, etc. We are simply open and observe more than usual when these things are observed.
http://everythingforever.com/einstein.htm
I believe that Quantum Physics is where we will find that science meets spirit. Einstein had some issues with the quantum world, but he would have come around eventually. 
Or maybe I'm just touched in the head. 
I spent so much of my life trying to figure 'it' all out. If I could only understand people, their motivations, passions, etc., everything would be alright. People tend to reject you when you try to connect that deeply.
I have learned it is all so simple, but at the same time extremely difficult to comprehend how simple it is, because we expect things to be more complicated.
I have seen people that I knew were dead, doing ordinary things. Leaning against a building, waiting to go into a movie... Have never experienced what you have with the past eras though. How cool to see!
Energy cannot be destroyed, only changed.
Maybe I'm making no sense whatsoever, if so, I do apologize. It's late and I am tired, but you kick started my brain again for the night with your experiences. I tend to ramble on the days I can focus enough to write or read much. 
Namaste whathehell...
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