I think the problem with ideas like "The Holographic Universe" is that they are metaphors. Powerful, inspiring, empowering metaphors, but metaphors that people seem to need to believe "actually true". Like in the bible, it talks about how the holy spirit desended on Jesus, and they describe a Dove.
To me that is just a metaphor in a story that is trying to illustrate what happens when you wash away unhelpful thinking. The world clears up, you see things in a different light, etc etc.
To some the Dove is a Metaphor for the True Holy Spirit, that descended on the REAL HISTORICAL JESUS, others insist it was actually a real live dove that actually came down.
I think if you stick with the metaphor angle, and stay away from dudes on youtube trying to "prove" their metaphor, you'll be ok.
I just read a book called "Metaphors we live by" by Lakoff and Johnson, an easy to read book about the metaphors that are inherent and extremely prevelent in our everyday language.
And boy howdy, reality does NOT look the same to me now.
I think my take away from the holographic universe would be more along the lines of "we are made in god's image" or we are all manifested of the same conciousness energy, and everything posseses the same inherent basic interactive properties, be it between particles, people, dogs and cats, aliens and predators, etc etc. Or it could just be a wild hallucination based on how our brains are structure.
I haven't read that actual book but i've read several articles on the subject, so i could be totally off base.