Ooh, I love the PID theories - it's one of the first things (apart from the music) that first drew me into the Beatles legend. I love a bit of modern mythology now and then
However, I'm quite sure it was just coincidences - you start with an idea in your head and suddenly everything seems to work perfectly with it (I've tried it myself, looking for the number 42, and suddenly it's
everywhere ) But I have to admit that listening to backward music is quite creepy in itself...
In fact, I'm such a fan of the whole conspiracy theory I made a parody (with photgraphic 'evidence') called PTLVNAT (Paul Takes Little Vacations Now And Then) to entertain my sister - first disproving PID, before launching into an even sillier theory...