Originally posted by: Arnie.d
It's without a doubt a deliberate creative decision

Looks like Obi-wan's Mini-me force ghost (from Ep II) sneaking up on Anakin.

Thanks Arnie! I am at work right now and as I read that I started laughing like an idiot. I hate it when people ask you what you are laughing at. They wouldn't find it funny if I told them. Hmm, I should memorize some hysterical dirty joke and have it on hand to tell them if something like this happens again.

My second guess about that thing would be that it is the ghost of Sir Alec Guinness. The poor man's spirit is trapped in a personal hell where he has to spend eternity on the set of Lucas' movies. I would say it is possible he haunts Skywalker Ranch by choice, but I know he would have better things to do with eternity than waste his time like that.
It must be awful, just imagine those walls of endless green screen his poor tormented spirit has to bounce around in all day. The mere thought makes me shudder!