What about it is paranormal? We're not talking about ghosts. We're reasonably sure other universes exist and somewhat sure they're causally disconnected from us, but stuff like quantum immortality isn't paranormal, it's just weird. The Many Worlds Interpretation of QM is very weird, but not paranormal in the least. If all these branching universes exist, who's to say we don't occasionally slip in and out of them?
Might as well talk about ghosts because the Mandella Effect works on the same mental mechanism.
People see ghosts due to a misprocessing of visual information in the brain combined with external sensory input. In short - people mis-see see things. It's fairly rare, but it does happen. The Jaws-Holly thing is a great example where rational people swear she had braces, but the evidence is clear that she did not.
The people who thought she had braces didn't see the movie in a parallel universe, their brains made a judgement call based on the visual information in the scene where Holly is in pigtails, which in 1979 was nerdy, and for a Bond movie- definitely nerdy.
Pigtails+Glasses+Jaws=Braces...right? The assumption was Jaws fell in love with her because she had braces, and not desirable cleavage, and great legs. The viewers who "saw" braces made a visual interpretation. Later on the two are on the space station and she clearly does not have braces.
Yes, it's kind of creepy to have an image in your mind that you are sure you saw, and then find out you didn't see it. Welcome to my world.
The idea that this is all caused by parallel universes, worm holes, and whatnot is layman's Quantum Physics applied to justify woo.