Keep in mind that I am pulling all of this out of my ass.
So. The stuff happening with the planets is sometimes indicative of what is going on with the humans. Astronomically, Mercury isn't really going backwards, but it's going backwards from the perspective of this halfassed planet, so everyone on, or with strong ties to (especially natal ties, as in, born on) this half-assed planet, is going to be looking at all the other stuff from the perspective of this planet.
In the normal flow of events, Mercury goes tootling happily along, and communications and information flows are going as predictable. Those listening closely to the information-flow of the universe are listening, those half-ignoring it are half-ignoring it, and all goes as planned, more or less.
When Mercury goes retrograde, from Earth's perspective, all of this suddenly changes. Mercury is now backtracking along some of the same things that it was covering before, and the informational and communicative signals ruled by it are coming out all fucking backwards.
Those who listen to the signs during normal events are suddenly getting their input backwards. Those who didn't hear communication well to start with are suddenly not only not hearing the usual background mutterings, but they're suddenly hearing background mutterings -- backwards.
Mercury Retrograde. People read things they thought they were reading right, wrong, and there is potential for cascading snowball.
So why, then, am I suddenly coming out with bizarre and amazing flights of insight that I would ordinarily never arrive at?
My first thought was that I am just weird and contrary, and the backwards flow of information suits my style far better. And that may be part of it. But I was affected by the last one. I do, however, learn fast. And I operate in both contrary and straightforward modes. But why would I be picking up on things that would usually be so subtle to me? I miss a hell of a lot, even for how good I am... this is freaky.
Then I came across this idea, rummaging around in my head: we're getting two inputs from Mercury, and they're roughly cancelling each other out, except the signal from its current path (crossing over the past path, which is what we're revisiting, causing the echo) is way stronger, so not only are we getting the backwards info, we're getting an echo of what we are used to hearing, of stuff that was current at the last point Mercury was right where it was. This is megaconfusing for most, and accounts for some of the garbles that mere backwards could never accomplish on its own.
Only someone who's very well attuned to the correspondences between what Mercury's saying and what is actually going on is going to pick up on what is actually going on. I seem to be doing this. From my perspective, the universe normally talks to me in a conversational tone of voice. Right now, it's SHOUTING, and what it's shouting are the things I'm used to hearing, so I can filter those out easily. But what are usually whispers are amplified, and I'm hearing those things loud and clear.
What can the ordinary, average person do to take advantage of the hidden properties of a Mercury Retrograde?
If there's a communications issue that you are having, if there is something that you want to make sure is its utter clearest at any time, Mercury Retrograde is the time to pull it out and hack at it. If you can make it perfectly intelligible during a Mercury Retrograde, it's going to be sparkling at a normal time of the planets. Take out any projects of communication that you've been working on for a while (a marriage proposal, a formal letter to a superior, a college application essay) and hash it over with someone you know and trust. Have them tell you the parts that they don't understand, and have them tell you what they think it means. After you've explained yourself to them, so both of you finally understand, you should be able to rewrite it so not even the densest manager could miss your point when you finally deliver it after the retrograde has finished.