If you are wondering about what is possible in a lucid dream in very advanced levels then you are going to get too many different answers. But in general some things I've read are... Shape shifting, meeting your anima/animus, solving seemingly impossible questions/equations in real life, evolving and growing in a dream (you, DC's, companions/animal followers), learning new things from dream teachers, creating accurate replicas of movie scenes/shows, going to the same dream scene every time and building new things inside it which will be there next time you dream (Dream headquarters/homes), traveling to different solar systems and unknown places.
Since they are dreams there really aren't any possibilities you can rule out, this is without even starting to mention things you can do while you are 'beyond dreaming'
And I believe people can have close to 100% recall, but of course not even in real life are you paying 100% attention even if you use ADA

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