The strange thing about looking into a mirror when having a dream/LD/AP is that, for some reason, the mirror distorts the image of the individual staring into it. And, as I'm sure you learned, it isn't generally in the funhouse/water ripple way. It's more of the nightmarish, full-stop horror way.

When jumping into a mirror in a dream, it seems to often serve as a portal. That is, jump in, and it will spit you out wherever you may desire.

Yeah, mirrors are pretty odd in dreams.