Don't worry about the mix-up, it's pretty common.

A dream like the one you had is rare for me as well...I feel that dreams often have deep meanings to them. There are some that just seem to be a random jumble of the day's events, but imo in general dreams are not meaningless. And the more you pay attention to them, the more your mind realizes that, so it starts giving you more vivid and meaningful messages in your dreams. I think that it's important to look at the emotions you felt during the dream. It tells you a lot about what it might mean.