If you're talking about dreams and not real life (for a stupid moment I thought you were, and had a link to send you to!), I'd suspect that a lot of it has to do with dreams' tendency to symbolize things so that we won't take them too literally. If your best friend in a dream looks like your real best friend, then you'll assume that's who the dream means, your best friend. If your dream best friend looks like a total stranger, chances are 1. the dream wants you to notice something about your best friend which you wouldn't notice otherwise, or 2. the dream isn't telling you about your best friend at all.
If there's someone in a dream who in real life you know would be a stranger, but in the dream they're a friend, that might be a sign (MIGHT) that they're an unrecognized aspect of yourself (unfamiliar figures in dreams often are, seeing as we don't know them in real life). Likewise, in a dream we might be in a place that we feel is "home," though it might not resemble our real home whatsoever--perhaps the dream is hinting that there's something we need to notice in our environment, because if our dream home looked just like our real home, how much would we pay attention to it?
i recently dreamed that i was in a house that was my house but it looked different and was in a different place. i went out to the back and it had a big extension with extra rooms and i felt really happy and confused about why me and my house mates had never used this space before.
This frequently happens in my dreams; I've had a recent long series of dreams involving me in a place that's supposed to be my brother's home (looks nothing like it), and I keep finding more rooms toward the back, which I have to explore to find a mysterious old man. Hidden/unknown rooms in a home are a common theme. Again, they might symbolize unknown aspects of ourselves.
If you're talking about real life and not dreams, Google "deja vu" and follow the link to the Wikipedia article, then browse the "Types of deja vu" and "Related phenomena."
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