It's not always easy to control the dream once you go lucid (For instance flying, can be difficult for people to do). In some of the LDs I've had, I'll be able to control what I'm doing, but I can't control where I am or what's going on around me, and some of the crazy things that are happening don't exactly seem out of place. However, as you improve your level of awareness in your dreams, you should be able to think more rationally and not encounter as many distractions.

As for that random stuff that happened in your dream. It sounds like you lost lucidity for a while, then got it back, and your dream took over inbetween. I think if next time you're lucid you concentrate on getting the dream clearer and keeping it that way, that will keep you from losing lucidity and also increase your awareness.

Basically, don't get discouraged. I hope that helps!