"Like 'deja vu' we get it wrong sometimes, and we 'see' stuff that isn't there."
Isn't it there? Can you prove that or is that just a theory? Can you prove that we get it wrong? I don't know of a single scientist researching deja vu that can prove what causes it. There are some very valid theories, such as bypassing of short-term memory into long-term memory, but none of them can be proved.