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[–] 2951213? 0 points 3 points (+3|-0) ago 

It is called Steganography: https://en.wikipedia.org/wiki/Steganography

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[–] Reversion 0 points 1 point (+1|-0) ago  (edited ago)

I don't know that this implies hiding information in people's minds. The point of steganography is to conceal the information to be retrieved later after some processing. If you're just watching a movie and there's info hidden using traditional steganographic techniques, you wouldn't notice it at all, subliminally or otherwise. You could try interspersing frames within the movie that might register visually to the watcher without their conscious knowledge, but this would probably limit you to imagery alone and there wouldn't be a guarantee that you could get your point across consistently among viewers. I'm also not an expert in any of this, so I can't tell you what current or prior research says. I'm sure it's been tested though.

Edited to fix typos.

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[–] binky 0 points 1 point (+1|-0) ago  (edited ago)

You would have to manipulate, or at least predict, Google's ranking system, details per result, and so forth.